Archaeologia Austriaca, Band 100/2016, 19–55 © 2016 by Österreichische Akademie der Wissenschaften, Wien doi: 10.1553/archaeologia100s19 19 Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution Ernst Pernicka Joachim Lutz Thomas Stöllner Abstract Zusammenfassung – Bronzezeitliche Produktion von Kupfer am The rich copper ore deposits in the eastern Alps have long been considered as important sources for copper in prehistoric central Europe. However, the role that each deposit played is not clear. To evaluate the amount of prehistoric copper produced from the various mining regions, we attempted to link prehistoric metal artefacts with copper ores based on the geochemical characteristics of the ore deposits that were exploited in ancient times. Alongside the usage of ores as shown by the finished products, the production aspects, the quantity and variation over time must also be considered. Recent archaeological investigation has allowed these datasets to be combined in order to show the importance of one of the largest Bronze Age mining fields in Europe. More than 120 ore samples from the well-known mining regions of Mitterberg, Viehhofen, and Kitzbühel were analysed for lead isotope ratios and trace element concentrations. These results were combined with analytical data generated by previous archaeometallurgical projects in order to compile a substantial database for comparative studies. In the Early Bronze Age, most metal artefacts were made of copper or bronze with fahlore impurity patterns, and most examples from this period match the fahlore deposits in Schwaz and Brixlegg. At the end of the Early Bronze Age, a new variety of copper with low concentrations of impurities appeared. The impurity patterns of these examples match the ores from the Mitterberg region. Later, in the Middle Bronze Age, this variety of copper almost completely replaced the fahlore copper. In the Late Bronze Age, the exploitation of the ores changed again and copper with a fahlore signature reappeared. The reason for the renewed copper production from fahlores might have been a decline of the chalcopyrite mines. But it was more likely due to the fact that the rising demand for copper could no longer be met by the chalcopyrite mines alone. The examples from the Early Iron Age show no fundamental changes in metal composition. The copper metallurgy in the Early Iron Age is based on the traditions of the Late Bronze Age. Mitterberg und seine Verteilung Die reichen Kupferlagerstätten in den Ostalpen werden seit langem als wichtige Rohstoffquellen für das Kupfer im prähistorischen Europa betrachtet. Dennoch war bislang nicht so klar, welche Rolle einzelnen Lagerstätten in diesem Zusammenhang zukam. Um die Bedeutung der Kupferproduktion in einzelnen Bergbaurevieren besser zu verstehen zu können, wurde nach der Verbindung zwischen Metallartefakten und der geochemischen Charakteristik einzelner in prähistorischer Zeit abgebauten Lagerstätten gesucht. Doch neben den Aspekten der Nutzung von Erzkörpern, welche durch die Endprodukte angesprochen sind, müssen auch Produktionsfragen, etwa nach der Gesamtmenge der Kupferproduktion und ihrer zeitlichen Variation, beachtet werden. Jüngste archäologische Untersuchungen erlauben eine präzise Kombination beider Datengrundlagen. Sie ermöglichen neue Einblicke in die Bedeutung einer der größten Bergbaulandschaften der Bronzezeit in Europa, des Mitterbergs. Mehr als 120 Erzproben der gut bekannten Bergbaureviere Mitterberg, Kitzbühel und Viehhofen wurden anhand ihrer Pb-Isotopen-Verhältnisse und Spurenelementmuster untersucht. Diese Ergebnisse wurden mit bisherigen analytischen Daten archäometallurgischer Projekte kombiniert und so eine substantielle Basis für Vergleichsstudien erreicht. In der Frühbronzezeit bestanden die meisten Metallobjekte aus einem Kupfer mit typischer Fahlerzsignatur. Es passt gut zu den Fahlerzlagerstätten von Schwaz und Brixlegg. Am Ende der Frühbronzezeit erschien eine neue Kupfervarietät mit geringeren Spurenund Nebenelementanteilen. Dieses Spurenelementmuster stimmt bestens mit den Erzen der Mitterberger Bergbauregion überein. In späterer Zeit verdrängte diese Kupfersorte gänzlich das FahlerzKupfer. In der späten Bronzezeit änderte sich die Ausbeute der Erze erneut und Fahlerzkupfer-Signaturen erschienen erneut. Der Grund für die erneute Ausbeute des Fahlerzkupfers könnte ein Rückgehen der Kupferkiesproduktion sein, wahrscheinlicher ist aber, dass die Kupferkiesproduktion den Bedarf an Kupfer allein nicht mehr zu decken vermochte. Die Funde der frühen Eisenzeit zeigen keine fundamentalen Änderungen in der Metallzusammensetzung mehr. Die Kupferproduktion der frühen Eisenzeit basiert im Wesentlichen auf den Traditionen der Spätbronzezeit. Keywords Mitterberg, prehistoric mining, copper production, lead isotope analysis, provenance of copper, eastern Alps. 20 Ernst Pernicka, Joachim Lutz, Thomas Stöllner Schlüsselbegriffe Mitterberg, prähistorischer Bergbau, Kupferproduktion, Bleiisotopenanalyse, Herkunft von Kupfer, Ostalpen. 1. Introduction (E. Pernicka, J. Lutz, T. Stöllner) It has long been known that the copper deposits in the Mitterberg region in the eastern Alps were mined on a large scale. Mitterberg is actually the first copper mining site that was investigated archaeologically.1 Ground-breaking studies on the production processes used were published by Kyrle and Klose,2 and on the mining techniques and ore beneficiation by Zschocke and Preuschen.3 They documented numerous mines and the remains of extractive metallurgy like furnaces and close to 200 slag sites. The site was exceptionally favourable for the study of ancient mining and smelting techniques, because the mine seems to have been abandoned after the Bronze Age. It was only rediscovered in 1827; mining resumed in 1837 and ended in 1977. There was therefore no medieval or later exploitation of the mine that would have destroyed most of the ancient traces. Further investigation addressed earlier research activities in the area around the mines, e.g. the work of Richard Pittioni and his fellow researchers4 at the prehistoric mining region of Kitzbühel some 50 km further west. In the Mitterberg region, archaeological research concentrated on ore beneficiation5 and the search for settlement structures. These are preferentially located in the valleys and the focus was on subsistence strategies6 and the spatial organisations of the mining communities and their structures.7 New underground investigations8 began with the HiMAT research cluster that was based at the University of Innsbruck and comprised multidisciplinary research on all aspects of mining in the eastern Alps.9 A summary of this project was published in the series ‘Archäologie Österreichs Spezial’ Volume 4.10 In the following paper, we will concentrate mainly on the mining region around the town of Bischofshofen, commonly addressed simply as the Mitterberg prehistoric mining region, its production of copper in the Bronze Age as reflected by field studies and chemical and isotope analy- Much 1878. – Much 1879. Klose 1918. – Kyrle 1918. 3 Zschocke, Preuschen 1932. 4 Preuschen, Pittioni 1937. – Pittioni 1947. – Preuschen, Pittioni 1954. 5 Eibner-Persy, Eibner 1970. – Eibner 1972. – Eibner 1973. 6 Lippert 1992. – Shennan 1995. 7 Stöllner 2003. 8 Stöllner, Eibner, Cierny 2004. – Stöllner et al. 2009. 9 Oeggl et al. 2008. 10 Goldenberg et al. 2012. – Stöllner et al. 2012. ses of its ores, and by copper-based artefacts in central and northern Europe. 2. Geological Setting and Mineralisations (E. Pernicka) The most important ore deposits in North Tyrol, Salzburg and Styria occur in the Greywacke Zone, a belt of Paleozoic sedimentary rocks trending from east to west in the Austrian Alps between the northern Calcareous Alps and the central eastern Alps. The unit consists of Paleozoic sediments (turbidites, greywackes and limestones) from the Ordovician to Devonian age and of mafic volcanic rocks from the Cambrian/Ordovician age. These rocks are relatively soft and prone to weathering. In the western Upper Inn Valley near the Arlberg, the Greywacke Zone forms only a narrow strip, but then widens to the east to include large parts of the Tux Alps, the Kitzbühel Alps and the Salzburg Slate Mountains. Further to the east it runs along the upper Enns Valley, the Eisenerz Alps and the Mürz Valley. Numerous copper deposits occur in this sedimentary unit, related to mafic volcanism. The primary ore assemblage consists mainly of chalcopyrite and pyrite11 on the one hand, and fahlore12 on the other. Traces of ancient mining show that many of these deposits were exploited in prehistory. Well-known prehistoric mining areas belonging to this zone are (from west to east) Schwaz and Brixlegg in the Lower Inn Valley,13 the Kitzbühel region,14 Viehhofen in the Glemmtal, the Mitterberg region south of Salzburg15 and other mining districts in the Eisenerz Alps and Lower Austria further to the east (Fig. 1). It has always been presumed that these mines supplied copper for large parts of central Europe in the Bronze Age. However, such claims have not been supported convincingly by demonstrating a clear relationship between ores and Bronze Age metal artefacts, although many analyses were performed by Pittioni and Neuninger.16 An example is the discussion on the provenance of the so-called Ösenringe, which are mainly found in hoards, and in some cases in large numbers. They were usually interpreted as ingots, i. e. for the storage and transport of raw copper, and their geographical distribution was related to the east Alpine copper deposits.17 1 2 11 Mitterberg: Bernhard 1965. – Weber, Pausweg , Medwenitsch 1972. – Weber, Pausweg , Medwenitsch 1973. – Weber 1997. 12 Schwaz/Brixlegg: Gstrein 1988. – Gstrein 1989. 13 Rieser, Schrattenthaler 1998–1999. 14 Preuschen, Pittioni 1937. – Goldenberg 2004. – KochWaldner, Klaunzer 2015. 15 Zschocke, Preuschen 1932. – Eibner 1994. – Stöllner 2011. 16 E.g. Pittioni 1957. – Pittioni 1959. – Neuninger, Pittioni 1962. – Neuninger, Pittioni 1963. 17 Bath–Bílková 1973. – Menke 1982. Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution 21 Fig. 1. Prehistoric mining districts in the eastern Alps. Graphic symbols: squares = areas with a large number of copper smelting sites; downward pick hammer = ancient/prehistoric mining areas; circles = prehistoric copper-producing mining regions (after Stöllner 2009). On the other hand, work by Neuninger and Pittioni18 based on trace element analyses concluded that the Ösenhalsringe came from Slovakia or the Carpathian Mountains because of the high concentrations of arsenic, antimony and silver in these artefacts, suggesting the use of fahlores for the production of this copper. Since fahlores are only an accessory component in the ores from the Mitterberg, they excluded this region as a possible source for this type of copper. However, a small percentage of the Ösenringe did match the Mitterberg ores chemically and they called this type of copper, with a significant trace-element pattern, ‘Typ Mitterberg-Kelchalm’.19 The problem with these analyses is that they were obtained using semiquantitative atomic emission spectroscopy. Element concentrations were only reported with symbols (+++, ++, +, tr) and the authors stated that each symbol would indicate the order of magnitude of the element concentrations. Unfortunately, this is not correct as has been shown by Christoforidis and colleagues,20 who compared the results with neutron activation analyses of a number of the same ore samples from Kitzbühel and Schwaz that were analysed by Neuninger. Subsequently, most geochemical and mineralogical investigations focused on the mining areas of Schwaz and Brixlegg due to their historical 18 19 20 Neuninger, Pittioni 1963. Neuninger, Pittioni 1963. Christoforidis, Pernicka, Schickler 1988. importance for metal production in more recent times beginning in the 15th century AD.21 In contrast to these areas in North Tyrol, only limited modern analytical data (INAA, ICP-MS, lead isotopes) were available from the Mitterberg region. These will be presented here. In the Mitterberg region there are three recognisable lithological units22 that are interpreted as sediments ranging from the Silurian to the Devonian age (grey series) and interspersed with basal conglomerates (e.g. at the Götschenberg), to Upper Carbonaceous (violet series) and Permian (green series). The grey series was deposited in a marine basin, partly under strongly reducing conditions. This is reflected in the vegetation remains that are rich in uranium. The series was folded during the Variscan orogeny and is discordantly overlain by the violet series that resembles the formation of flysch. It is also characterised by uranium anomalies. The green series was deposited under very different conditions that may have mobilised the copper, but essentially, the copper deposits are mainly strata-bound. The Alpine orogeny caused fractures in the green series and may have led to partial remobilisation of the metal inventory according to some features of a hydrothermal deposition like bleaching Höppner et al. 2005. Weber, Pausweg, Medwenitsch 1972. – Weber, Pausweg, Medwenitsch 1973. 21 22 Ernst Pernicka, Joachim Lutz, Thomas Stöllner 22 Fig. 2. Simplified geological profile of the Mitterberg region (Weber, Pausweg, Medwenitsch 1972) with the southern sector and the main lode, and an intercalation of quartzitic conglomerates in the lower parts of the violet series that are exposed at the Götschenberg at a lower altitude (Deutsches Bergbau-Museum, Bochum, Ruhr-Universität Bochum, Institute of Archaeological Studies). zones along the main lode reported by Clasen.23 A schematic profile of these geological units and their relationship to the copper deposits is shown in Fig. 2. As described above, the mines of the region can be divided into three sectors: the main lode that continues towards the east with several smaller veins; the sector south of the Mühlbach creek with the Brander, Burgschwaig, and Birkstein lodes; and finally the Buchberg and Winkel lodes east of the Salzach River. The mineralisations also show three types that are usually associated with different stages of ore formation. The main lode north of the river is a very large discordant steep vein system that cuts the grey and the violet series and is zoned vertically. According to Bernhard,24 the first mineralisation stage was dominated by nickel-rich pyrite (FeS2), the second by chalcopyrite (CuFeS2), which is the dominant mineral species, and the third by cobalt-rich copper ores mainly in the eastern extensions from the main lode and in the Buchberg lode that also strikes on an axis from north to south. In the southern sector the mineralisation is strictly strata-bound with small veinlets of pyrite, chalcopyrite and erythrite (an oxidised cobalt arsenate). Accessory minerals include gersdorffite (NiAsS), millerite (NiS), arsenopyrite (FeAsS) and fahlore, mainly of the tetrahedrite (Cu12Sb4S13) type. This can include arsenic, because tetrahedrite forms a solid solution with its arsenic-bearing tennantite (Cu12As4S13). A host of other rather minor accessory minerals are known but are irrelevant for this discussion. The gangue material mainly consists of quartz (SiO2), dolomite (CaMg(CO3)2), siderite (FeCO3) and ankerite (Ca(Fe,Mg,Mn)(CO3)2). 3. The Mitterberg: A Large Copper-Producing Region in the 2nd Millennium BC (T. Stöllner) If we consider the question of a metal ore deposit and its socioeconomic importance, we must look both at processes of production and consumption. Ideally these factors overlap chronologically and/or in quantity once produced and consumed. However, since the record of archaeological and archaeometric sources is incomplete, we must be more moderate in our expectations. Our knowledge about copper production in the eastern and southern Alps has reached a considerable level:25 technology, subsistence and development in time can be described in general terms. In some parts of the mining district, our knowledge includes detailed insights into the structural components of living and working and their development over time. This is certainly the case for the mining sectors alongside the Salzach Valley and around the town of Bischofshofen26 (Fig. 3). The area is generally known as the Mitterberg mining region although the Mitterberg is only the name of an Alpine pastoral landscape around the largest mining relics of the Bronze Age (see above). Over the course of the research that started here very early in the 19th century, this region has gained a high profile. Consequently, the Mitterberg process describes the technological and economic complex and the principles of copper production from chalcopyrite, which is the major ore mineral in this region.27 This technological complex consists of deep underground mining, various ore beneficiation steps and smelting in shaft furnaces, whose 25 23 24 Clasen 1974. Bernhard 1965. 26 27 See various contributions in Stöllner, Oeggl 2015. Eibner 1994. – Recently Stöllner 2015. Eibner 1982. Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution 23 Fig. 3. The Mitterberg mining region (the mining field of Mühlbach-Bischofshofen) at the centre of the Salzach-Pongau region as displayed by mining lodes (and their surface depressions), beneficiation and smelting sites as well as settlements, single finds and graves (Deutsches Bergbau-Museum, Bochum, Ruhr-Universität Bochum, Institute of Archaeological Studies). construction and operation principles are characteristic of many of the east Alpine mining regions of the Bronze- and Early Iron Ages. However, it is nowadays clear that the earliest remains of this technology are found in the Salzach-Pongau area, from where it may have spread to the entire eastern and southern Alps and beyond.28 4. The Mitterberg Process: Regional and Chronological Aspects (T. Stöllner) According to calculations by Zschocke and Preuschen29 and more recently by Stöllner et al.,30 we can consider the Salzach-Pongau mining region as the largest and most productive (see below) known in the eastern Alps and possibly even in Europe in the middle of the 2nd millennium BC. But to understand the socioeconomic conditions, the effects of population, landscape and exchange patterns (such as trade), 28 29 30 Stöllner 2009. Zschocke, Preuschen 1932. Stöllner, Hanning, Hornschuch 2011. it may be worth regarding the chronology of the spatial distribution in the Salzach-Pongau mining region. There is a bundle of ore deposits that were exploited during the 2nd and the early 1st millennium BC. The so-called ‘main lode’ in the north of the region must be considered the most important of the mining sectors. The veins range over several kilometres in a direction stretching from east to west from the piedmont of the Hochkönig massif and north of the Hochkeil peak to the eastern lodes near Bischofshofen.31 The western part, known as the St Josefi lode and its accompanying side lodes were mined to depths of nearly 120 m below the surface. Around the mines, several large ore dressing areas are known that reflect the time-consuming work of dry and wet ore beneficiation. At a somewhat greater distance, nearly 100 smelting sites were documented and partly dated (Fig. 3), which provide perfect insight into the spatial organisation of wood consumption, transport of (beneficiated) ores to the smelting sites, and the matte production that 31 Bernhard 1965. – Weber, Pausweg, Medwenitsch 1973. Ernst Pernicka, Joachim Lutz, Thomas Stöllner 24 Fig. 4. Bayesian modelling of the AMS 14C dates from the main lode (after Stöllner 2009; remodelled with OxCal v4.2.4) (Deutsches Bergbau-Museum, Bochum, Ruhr-Universität Bochum, Institute of Archaeological Studies). took place there. It is not yet clear whether black copper was also produced at these sites that were operated presumably in a seasonal manner. Production seems to begin around the 18th/17th century BC and reaches a climax between the 15th and the 13th centuries. A few younger radiocarbon dates as well as pollen and heavy metal records from local bogs indicate a general decrease in activity (Fig. 4).32 The mining sectors alongside the Salzach Valley are geologically different. The southern sector for instance consists of three lodes that are embedded syngenetically in the Si- lurian and Devonian slates of the grey series.33 These ore lodes do not match the rich ore mineralisation of the main lode. The Brander, Burgschweig and the Birkstein lodes are aligned alongside the Einödberg ridge from the northwest to southeast (Fig. 3). Evidence for ancient mining, such as mining depressions and glory holes, is abundant on the surface, accompanied by underground exposures as in the Arthur-Stollen. In the Middle Bronze Age, mining galleries reached depths of nearly 200 m.34 Similar to the main lode, beneficiation areas and also some smelting sites are located besides the mining entrances along the steep slopes of the Einöd ridge. From our field work it seems that all the mining and smelting activities were smaller in size and number compared with the main lode. Most of our knowledge derives from archaeological investigations at the Brander lode. Mining started there no later than the 19th and 18th century BC, and lasted at least until the Urnfield and Early Hallstatt periods. This is not yet reflected by 14C or dendrodates (Fig. 5) but by some single finds from the mining house ensemble at the Einödberg near the Höch farmstead.35 Even small-scale Copper Age mining seems conceivable according to scattered pottery fragments discovered around the Höch farmstead.36 A third mining area can be located east of the Salzach Valley. The Buchberg lode represents a series of mining depressions running from north to south with at least two lines of glory holes (Fig. 3). It seems that two lodes near the surface were mined during the Bronze Age. Only a few smelting sites are known in the surrounding area. According to modern underground galleries, the prehistoric miners did not reach the 100 m level below surface, but stopped before that. South of the Buchberg lode the east–west trending Winkel or Arzberg lode is situated. Only little is known about the time of exploitation and the technology used to mine this site, but at least one of the neighboring smelting sites was recently surveyed and dated to the Middle to Late Bronze Age.37 The variety of stone tools found in the surroundings of the Winkel lode suggests domestic activities nearby. This fits the general impression gained from all the mining sectors of the Mitterberg region. Mining houses and camps seem to reflect the usual way of life in the production areas during the (presumably) seasonally organised working periods. Although the exploitation of the Buchberg and Winkel lodes has not been precisely dated yet, there is no doubt it generally belongs to the Bronze Age. Another indication is provided by the Sky Disc of Nebra whose metal 33 34 35 36 32 Breitenlechner et al. 2014. 37 Weber, Pausweg, Medwenitsch 1972. Stöllner et al. 2009. Zschocke, Preuschen 1932, 114–125. – Recently Eibner 2016. Stöllner 2009, 42–45 and Fig. 5. Stöllner 2009, 44 and Fig. 6. Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution Fig. 5. Bayesian modelling of the AMS 14C dates from the southern mining sector (Brander and Burgschweig lodes) (according to Stöllner, 2009; remodelled with OxCal v4.2.4; Bronk-Ramsey, 2013) (Deutsches Bergbau-Museum, Bochum, Ruhr-Universität Bochum, Institute of Archaeological Studies). can be related to the eastern mining sector, especially the Buchberg lode. This would also suggest the beginning of mining operations at least in the later phases of the Early Bronze Age.38 Putting these pieces of information together, it is quite likely that mining first began east and west of the Salzach Valley before the more demanding big ‘enterprise’ at the remote main lode could be opened. This underlines the importance of the Salzach Valley where we can locate various important activities. Smallscale settlements are known from various hill-top sites alongside the Salzach River, but larger settlements are still missing. They may have been buried beneath river sediments in the valley and there are indeed some indirect indications39 of this. These include stray finds of bun ingots, a few graves, and also scattered indications of flat settlements may eventually revise opinion in favour of a densely settled area around Bischofshofen.40 This is made even more apparent during the later Urnfield period and the Early Iron Age by the large Pestfriedhof cemetery,41 which was probably related to contemporary mining activities at the eastern part of the Hochkeil.42 Still lacking is clear evidence for the final production steps such as the reduction of matte to blister copper as well as the alloying and casting of objects. As argued elsewhere, it is at least clear that locally used toolsets must have been produced nearby.43 The majority of the bun ingots consist of foreign fahlore and chalcopyrite copper indicating regional exchange of different copper types that may have been melted together to produce finished products for regional demand and beyond.44 In summary, the Mitterberg/Salzach-Pongau copper deposits were exploited from the 19th or 18th century BC onwards. The peak of copper production occurred during the later phases of the Middle and the earlier phases of the Late Bronze Age (15th to 12th centuries BC) and may have declined especially at the main lode during the middle and late Urnfield period from the 11th century BC onwards. Nevertheless, mining continued to a certain extent into the Iron Age, when chalcopyrite copper was already being blended with fahlore-type copper (especially from the Inn Valley) on a large scale. Since intense contact with the southeastern Alpine regions is indicated by grave goods from the Pestfriedhof, it is important to ask if the mixture with fahloretype copper either from the Inn Valley or from regions south of the Alpine range became an important backbone of production in the later phases between the 10th and the 7th centuries BC.45 5. Approaches to Quantifying Production (T. Stöllner) It is difficult to assess the quantity of copper produced between the 18th and 7th centuries BC in the Mitterberg region. Since most mines are no longer accessible, it is impossible to calculate precisely the output of each mine in all periods of operation. As already mentioned, our knowledge is different in quality and quantity of dates for different mines (see Figs. 4–5). Based on radiocarbon dates from smelting sites, settlements and mining operations, we propose a Bayesian model for the southern sector and the main lode assuming that production was closely linked in both areas so that all the dates can be considered to relate to one general 40 41 42 43 44 38 39 Lutz et al. 2010, see below. Lippert 1992. 25 45 Stöllner et al. 2016. Lippert, Stadler 2009. For the mining area at the Hochmoos see Gstrein, Lippert 1988. Stöllner, Schwab 2009. – Stöllner et al. 2016. Stöllner et al. 2016. See Northover 2009. 26 Ernst Pernicka, Joachim Lutz, Thomas Stöllner Fig. 6. Temporal sequence of centennial dating occurrences (in percentage) of the main lode and the southern sector in correlation with a Gaussian standard distribution according to the dating limits of the single mining sectors; overarching events are counted 0.5 for each of the century (Deutsches Bergbau-Museum, Bochum, Ruhr-Universität Bochum, Institute of Archaeological Studies). period of operation. This will even allow us to model a more detailed yield of copper in different periods of operation (see Fig. 6). The number of 14C-dates from production sites is still too limited to support a detailed model, especially for the smaller sectors of the ‘Mitterberg’ region. But if we take account of all 75 dendrochronological and radiocarbon dates, we can give a rough production estimate especially for the main lode.46 The chronological sequence thus obtained Seventy-five dates have been obtained from the main lode: 32 14C dates (see Fig. 4) and 43 dendrodates with forest edges (Sormaz, unpublished report and Nicolussi, Pichler, Thurner 2015, 239–253, esp. 239–241). This contrasts with 20 14C dates from the southern district (see Fig. 5) and 40 dendrodates (Sormaz, Stöllner 2009). We would like to thank all colleagues for years of mutually fruitful and trustful cooperation, especially K. Nicolussi, T. Pichler, T. Sormaz and A. Thurner from Innsbruck and Chur. It must be mentioned that some dating sequences might well be overemphasised by the selection of samples that derive from excavation sites such as the Troiboden or the Arthurstollen gallery. 46 is in agreement with other parameters such as the detailed pollen- and heavy-metal records in neighbouring bogs.47 As described above, exact modelling is more difficult for the southern sector, and impossible for the mining sectors east of the Salzach Valley, because of an insufficient number of dates.48 If we regard the number of dates as a rough reflection of the intensity of mining, then this resembles a Gaussian distribution. There is no doubt that the most productive period at the main lode was between the 15th and the 13th centuries BC with around 70 % of all measured dates falling within this timeframe (Fig. 6). A similar chronological sequence can be observed when regarding the dates so far known from the southern sector (although there are archaeological biases). When combining all currently available dates, a focal period can be assumed between the 16th and 14th centuries 47 48 Breitenlechner et al. 2014. Stöllner 2009, 44 and Fig. 6. 27 Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution Tab. 1. Estimates of copper production and losses during the various production steps in the Mitterberg district. Copper content in the debris Dry beneficiation (5 %) Wet beneficiation (5 %) Dry and wet beneficiation (analyses and empirical data) 1.5 % Amount of copper left Loss on smelting 13 % (empirical data) Final amount 15,500 3900 (based on 25 % loss estimated from analyses) 11,600 Copper production main lode 17,000 Copper production main lode 17,000 250 16,900 2200 14,700 Copper production main lode, eastern part 1700 26 1700 220 1480 Copper production Brander lode 5300 80 5300 690 4600 Copper production Burgschweig lode 1100 17 1100 140 1000 Copper production Bürgstein lode 200 3 200 25 170 Copper production Buchberg lode 400 6 400 50 340 Copper production Winkel lode 800 12 800 100 690 26,500 400 26,400 3400 23,000 Sum (rounded values) 830 830 BC, and this would comprise around 80 % of all measured dates (Fig. 6). This still leaves open the question of how to achieve a reasonable calculation of the amount of copper once produced. As the mines themselves are not accessible any longer, any estimate has to be based on earlier calculations outlined by Zschocke and Preuschen.49 They started from mining debris and their copper content, which they calculated according to empirical data after nearly 100 years of modern mining. As the Mitterberg deposits did not have large oxidised enrichment zones, even near the surface, it is easier to assume an average copper content there than elseZschocke, Preuschen 1932. Zschocke, Preuschen 1932 Stöllner, Hanning, Hornschuch 2011 where. In following steps, Zschocke and Preuschen50 calculated the losses but did not base them on empirical data, preferring assumptions (e.g. in dry and wet beneficiations, in the smelting processes). It has recently been shown by analytical and taphonomic studies of beneficiation and smelting sites51 that the losses are smaller than previously assumed. This indicates better control of copper losses and greater yield of copper (see Tab. 1). Using the new figures on copper losses, we calculate that roughly 14,700 t of copper were produced at the main lode Zschocke, Preuschen 1932, 128–135. Stöllner, Hanning, Hornschuch 2011. – Hanning et al. 2013. 50 51 49 Reference 28 Ernst Pernicka, Joachim Lutz, Thomas Stöllner Tab. 2. Estimate of copper production at the main lode and the southern sector in the context of a rough estimate outlining the temporal development of production. Initial period (18th−16th cent. BC) Copper production, main lode district (metric tons, %) 10,600 (72) 2580 (18) Initial period (19th/18th−17th cent. BC) Boom phase (16th−14th cent. BC) Posterior phases (12th cent. BC to ?) 580 (101) 4600 (83) 340 (6) and about 5500 t for the Burgschweig and Brander lodes together (southern sector). In total, this means that roughly 20,000 t of copper were produced in the Mitterberg mining region between the 16th and 13th centuries (Tab. 2). This may provide a general idea about the important position that the Mitterberg deposits once had during the Middle and the beginning of the Late Bronze Age for the neighbouring regions, and even for the transregional distribution of copper. There is no doubt that more detailed information on the periods of operation and also on further econometric parameters may influence and even alter the numbers given here. However, such calculations are certainly a step forward to arriving at a better understanding of the economic and social impact of this production centre for the European Bronze and Early Iron Age. 6. Samples and Analytical Techniques (E. Pernicka, J. Lutz) In order to obtain an overview of the chemical and lead isotope composition of the copper ores for comparison with Bronze Age metal artefacts, 95 ore samples and 12 slag samples were collected in several field campaigns in total. It must be mentioned that it is not at all easy to collect representative ore samples in such a large mining region. First, apart from the Arthurstollen, the mines are no longer accessible, so samples had to be sought in waste heaps and significant outcrops near the ancient shafts. However, the best find locations had been depleted by mineral collectors, while less-known spoil heaps are usually overgrown by vegetation and not easy to identify in the field. The samples are listed in Table 352 and the sampling locations are roughly equally distributed between the three sub-regions shown in Figure 7. They were chemically analysed using neutron activation analysis (NAA, for Fe, Co, Ni, Cu, As, Sb, Ag, Au, Se, Te, Zn, Sn) and inductively coupled plasma mass spectrometry with a quadrupole ion filter (QICP-MS, for Pb, Bi) (Tab. 4)53. Furthermore, the lead isotope ratios were determined in some of the ore samples and, in addition, in some slag samples from the Mitterberg region using multi-collector ICP-MS following the procedure described by Niederschlag et al.54 The isotope ratios of lead were measured and corrected for mass discrimination by addition of Tl. A value of 205Tl / 203Tl = 2.3871 was taken and an exponential relationship assumed. 204Pb was corrected for the isobaric interference with 204Hg by measuring 202Hg and using a 204Hg / 202Hg ratio of 0.2293. The in-run precision of the reported lead isotope measurements was in the range of 0.02 to 0.08 % (2σ) depending on the ratio considered. To assess the impact of the Mitterberg region on the regional supply of copper, some 800 samples of mainly Late Bronze Age prehistoric copper and bronze finds from North Tyrol, Salzburg and southern Bavaria were available. These were analysed by energy dispersive X-ray fluorescence during a research project funded by the Volkswagen foundation.55 An even larger number of chemical analyses of Early Bronze Age objects exists from central Europe. These data were obtained with emission spectroscopy and compiled during the research at the Württembergisches Landesmuseum Stuttgart.56 From the Middle Bronze Age and Early Iron Age, only few analyses have been published. The second focus of our research was to analyse bronze objects especially from the Middle Bronze Age and the Early Iron Age to close these gaps in the chronology, and to compile a substantial database for the east Alpine region with analyses of finds from the beginning of metallurgy in the Neolithic up to the Early Iron Age. About 730 objects were sampled (drill samples) and analysed using X-ray fluorescence (XRF), with selected samples also screened using NAA, QICP-MS and multi-collector ICP-MS (lead isotope ratios). Niederschlag et al. 2003. Sperber 2004. 56 Junghans, Sangmeister, Schröder 1968a, b, c. – Junghans, Sangmeister, Schröder 1974. 54 55 53 Posterior phases (12th−9th cent. BC) 1440 (10) Copper production, southern district (metric tons, %) 52 Boom phase (15th−13th cent. BC) Table 3 can be found on pp. 48–50 at the end of this paper. Table 4 can be found on pp. 51–53. Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution 29 Fig. 7. The Mitterberg mining region (the mining field of Mühlbach-Bischofshofen) and its main Bronze Age mining fields (green) with the sampling locations of slag heaps, slag tempered ceramics, and ores (Deutsches Bergbau-Museum, Bochum, Ruhr-Universität Bochum, Institute of Archaeological Studies). 7. Trace Element and Lead Isotope Patterns of the Ores (E. Pernicka, J. Lutz) A major characteristic of the copper ores of the east Alpine Greywacke Zone is their generally low concentration of impurity elements. In the copper ores from the Mitterberg region only arsenic and nickel are generally present. This is due to the occurrence of gersdorffite, as is indicated by the high correlation of arsenic and nickel (Fig. 8a). In the east Alpine Greywacke Zone, two major types of copper ore are typically found: fahlores of the tennantite-tetrahedrite series (Cu12As4S13 - Cu12Sb4S13) and chalcopyrite (CuFeS2) / pyrite (FeS2) ores. In the Mitterberg region, fahlores do exist but only as an accessory mineral. Accordingly, the copper ores have relatively low concentrations of As, Sb, Ag and Bi. There is only a weak correlation between arsenic and antimony at concentrations above 1 % (Fig. 8b), which may indicate that these samples do contain some fahlore. Since fahlores are usually the major carriers of silver in such a mineral association, there should also be a correlation visible in the silver-antimony diagram (Fig. 8c). However, since this trend is rather weak, if present at all, the fahlore at Mitterberg seems to contain silver only in the range of 0.1 % as indicated by one sample with almost 10 % antimony. This is quite different from the fahlores in the Inn Valley that contain around 1 % silver and often more, but it is similar to the copper ores around Kitzbühel.57 However, the chalcopyrite ores from the Mitterberg region can be differentiated from the ores from Kitzbühel-Kelchalm, which are otherwise quite similar, by their lower bismuth and selenium concentrations. Among the Mitterberg veins there are also some systematic differences that can be visualised by regarding the pattern of seven trace element concentrations (Fig. 9). For example, the Brander lode contains more cobalt and nickel than the other veins.58 The lead isotope ratios of ores from the Greywacke Zone show a large variation (especially in the Mitterberg main lode) due to generally low lead combined with 57 58 Christoforidis, Pernicka, Schickler 1988. Lutz et al. 2010. Ernst Pernicka, Joachim Lutz, Thomas Stöllner 30 100 Ni [%] 10 1,0 0,10 a 0,01 0,001 0,01 0,10 1,0 10 100 As [%] 10 Sb [%] 1,0 0,10 0,01 b 0,001 0,001 0,010 0,10 1,0 10 100 As [%] 10 Sb [%] 1,00 0,10 0,01 occasionally high uranium concentrations. When a mineral crystallises and incorporates lead into its crystal structure, it acquires the Pb isotopic composition of its parent reservoir. This is called ‘common lead’.59 Since copper and lead minerals incorporate Pb, but generally cannot accommodate uranium and thorium, the lead isotope ratios will not be changed unless subsequent processes result in the addition or loss of lead, or the addition of U and Th. This is used in geology to infer a date for the formation of these crystals using the so-called ‘common lead method’. In archaeometry, one simply uses the fact that lead isotope ratios in copper and lead deposits can be different and thus distinguished from each other depending on the time of their formation and the geochemical environment of their source regions. As described above, the Mitterberg copper ores are closely associated with uranium minerals so that in an ore charge there will be ‘common lead’ mixed with radiogenic lead. The latter is the lead that was produced by the radioactive decay of uranium and thorium to radiogenic 208Pb, 207 Pb and 206Pb over the entirety of geological time up to the present. Since the mixing ratios of radiogenic and common lead can vary at the millimetre scale, each ore charge smelted may have different lead isotope ratios that vary over a large range. This is shown in Figure 10. Unfortunately, this situation is not just confined to the copper ores of Mitterberg. There are other deposits in the Old World that show a similar spread of lead isotope ratios, e.g. Rudna Glava in Serbia,60 Timna and Feinan,61 Sardinia,62 the Erzgebirge,63 and presumably many others. In an alternative diagram of the lead isotope ratios it may also be possible to distinguish between different regions, e.g. the Erzgebirge and Mitterberg (Fig. 11) which would not be possible in a diagram like in Figure 10. For this reason it is difficult to establish a relationship between a single metal object and the Mitterberg deposits based only on lead isotope ratios. However, as we shall see below, the slope of the correlation trend may be different in different regions so that a suite of copper objects that is thought to derive from one region can, with limitations, still be related to it by lead isotope ratios. The lead of syngenetic ores from the Mitterberg region (Winkel, Buchberg, Brander, Burgschwaig and Birkstein lodes), KitzbühelKelchalm and Viehhofen is less radiogenic than the lead of the epigenetic Mitterberg main lode. In summary, we are c 0,001 0,001 0,010 0,10 1,0 Ag [%] 59 60 61 Fig. 8. Diagrams of element concentrations in the ore samples from Mitterberg, (a) As-Ni, (b) As-Sb, (c) Ag-Sb (CEZA, Mannheim). 62 63 Faure, Mensing 2005. Pernicka et al. 1993. Hauptmann et al. 1992. – Hauptmann 2007. Boni, Köppel 1985. Niederschlag et al. 2003. Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution 31 Fig. 9. Trace element patterns in ores from the Kelchalm deposit and from the Mitterberg region (several different veins). The interdecile range for some elements (Sb-As-Ni-Co-Ag-Se-Bi) is plotted on the Y-axis in the same order. The trace element signature of the Kelchalm deposit is clearly different from the Mitterberg veins (CEZA, Mannheim). 2,12 2,08 208Pb/206Pb 2,04 main lode southern district eastern district copper slag Kitzbühel Kelchalm Viehofen 2,00 1,96 1,92 Fig. 10: Lead isotope ratios in ores from the Mitterberg region. The ores from the epigenetic main lode are more radiogenic than the syngenetic ores from the other veins (CEZA, Mannheim). 1,88 1,84 0,70 0,72 0,74 0,76 0,78 0,80 0,82 0,84 0,86 207Pb/206Pb now confident that the ore deposits we have investigated up to now can be differentiated geochemically by combining trace element concentrations and lead isotope ratios. 8. Comparison with Bronze Age Metalwork (E. Pernicka, J. Lutz) 8.1 The Metal Hoard from Moosbruckschrofen (Middle Bronze Age) This hoard (about 360 objects) is the largest metal accumulation of the Middle Bronze Age in central Europe. It was found in 2001 in a crevice of the ragged hillock Moosbruckschrofen near the town of Fliess64 and consists entirely of broken implements of various types including sickles, axes, swords, spirals, and ornamental discs in very good condition. It is interpreted as a cultic deposit rather than the accumulation of scrap metal.65 All metal objects except some black copper ingots were made of bronze and cover a range of some 200 years from the beginning to the end of the 64 65 Tomedi, Nicolussi Castellan, Pöll 2001. Tomedi 2001. Ernst Pernicka, Joachim Lutz, Thomas Stöllner 32 15,8 207 Pb/ 204 Pb 15,7 15,6 Erzgebirge eastern Alps 15,5 18,0 18,5 19,0 206 19,5 20,0 Pb/ 204 Pb Fig. 11. Alternative diagram of lead isotope ratios in ores from the Mitterberg region compared with copper ores from the Erzgebirge (CEZA, Mannheim). Fig. 12. Trace elements in blister copper from the Moosbruckschrofen hoard compared with ores from the Mitterberg region (CEZA, Mannheim). Middle Bronze Age. The impurity patterns of the bronzes and ingots are relatively uniform. The fragments of black copper are most suitable for provenance studies because their geochemical fingerprint was most likely not altered by alloying, mixing or recycling. The trace element analyses and lead isotope ratios of the blister copper and most of the bronze objects match the geochemical data of the ores from the Mitterberg (Figs. 12–13). Only arsenic tends to be lower than in the copper ore samples from the Mitterberg. Among the four elements considered it is the most volatile and can partly be lost on (re)melting. Actually, when considering lead isotope ratios, it is possible to be more specific and suggest the eastern sector as the most likely source of the ingot copper. Moreover, all ingots also consist of low-impurity copper consistent with the copper ores from Mitterberg. It is, therefore, impossible to decide if mixing of scrap metal Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution 33 2,12 main lode 2,08 southern district eastern district copper slag 208Pb/ 206 Pb 2,04 Moosbruckschrofen copper ingots 2,00 1,96 1,92 1,88 1,84 0,70 0,72 0,74 0,76 0,78 0,80 0,82 0,84 0,86 207Pb/ 206Pb Fig. 13. Lead isotope ratios in blister copper from the Moosbruckschrofen hoard compared with ores from the Mitterberg district (CEZA, Mannheim). had occurred or not, because on re-melting, copper from only one source would not induce any significant compositional change nor change the lead isotope ratios. If the interpretation of a cultic deposition is accepted then re-use of the metal is in any case not to be expected. Spindler even addresses the find at the Moosbruckschrofen as a ‘temple hoard’ and thus leaves no doubt about the symbolic character of its context.66 He also dates the earliest objects of the hoard, two wing-headed pins, in agreement with Tomedi67 to around 1600 BC, which is consistent with the field observations that, in the Mitterberg region, mining began east and west of the Salzach Valley, while the main lode seems to have been opened only somewhat later. 8.2 Late Bronze Age and Early Iron Age Finds from Southern Bavaria, Salzburg and North Tyrol In the 1990s, almost 800 prehistoric metal objects and ingots of black copper/fahlore copper from southern Bavaria, Salzburg and northern Tyrol were analysed within the scope of an archaeometallurgical project funded by the Volkswagen Foundation,68 including more than 70 bun-shaped ingots. About one quarter of these match the geochemical data of the ores from the chalcopyrite deposits (Mitterberg, Kelch- 66 67 68 Spindler 2006. Tomedi 2002. Sperber 2004. alm and Viehhofen). The impurity patterns of another quarter of the ingots correspond with the fahlore deposits of the Inn Valley. In contrast to the ingots, most bronze objects show mixed impurity patterns (Fig. 14a). There are two possible explanations for the mixed compositions. One interpretation is that metals of different compositions were mixed intentionally in order to reduce the high content of arsenic and antimony to a tolerable level and to improve forgeability. More probable is the existence of different hoarding practices. In the Late Bronze Age in central Europe and beyond, hoards of broken implements appear that often also contain broken ingots. These have commonly been interpreted as hoards of scrap metal intended to be re-used at some later time. In this case mixing would of course be unavoidable and since two major copper types were in circulation (fahlore and low-impurity copper) the result would be copper with compositions somewhere between the two end-members. Actually, there is a third possibility, namely the intentional addition of fahlore-type copper to low-impurity copper as a substitute for tin as suggested by inverse trends of tin concentrations compared with those of antimony and silver, especially in the later phases of the LBA.69 The reason might be a shortage of tin due to increased demand of metal. Stöllner et al. 2016. – For Swiss metals see Sperber 2004, 330 and Tab. 3. 69 Ernst Pernicka, Joachim Lutz, Thomas Stöllner 34 Fig. 14. Concentrations of silver and antimony in fahlores from the Inn valley Schwaz/Brixlegg) and in chalcopyrite ores from Mitterberg, Kitzbühel and Viehhofen compared with LBA ingots and bronze objects from Tyrol, Salzburg and southern Bavaria (a) and Early Iron Age bronze objects from Fliess (b). While the ingots largely reflect the different compositions of the ores, the bronze objects predominantly plot between the two clusters of copper ores indicating mixing (CEZA, Mannheim). The effect of mixing is seen in Figure 14a. The copper ingots with a fahlore signature (black copper) contain less antimony than the ores, which is due to the fact that substantial parts of arsenic and antimony are lost on smelting fahlores.70 Otherwise, only a few of the ingots show mixed signatures. Quite the opposite is true for the bronze objects, which exhibit predominantly mixed compositions. This pattern is retained in the Early Iron Age hoard of Fliess as shown in Figure 14b. This hoard was discovered in 1990 during construction works in the town of Fliess and comprises 385 bronze objects dated to the 7th and 6th centuries BC.71 It was investigated because little evidence existed for mining and extractive metallurgy in the east Alpine region in this period. It is unknown whether the decline at the end of the Bronze Age is real or merely a gap in archaeometallurgical research. The hoard contains many types such as brooches that can be identified as imports from distant regions, but also implements like winged axes, chisels, saws, and files that can be attributed to local production. The latter are plotted in Figure 14b and again show predominantly mixed compositions between fahlore signature and low-impurity copper. 70 71 Pernicka 1999. Sydow 1995. 8.3 Transregional Distribution of Mitterberg Copper The Early Bronze Age Nebra hoard, which comprises the Nebra Sky Disk, two bronze swords decorated with gold cuffs, two flanged bronze axes, two bronze arm spirals and one bronze chisel, was discovered during an illegal excavation in 1999 on the Mittelberg in southern Sachsen-Anhalt, central Germany. Scientific investigations of the hoard and particularly of the Sky Disk initially concentrated on authentication by mineralogical, trace element and lead isotope analyses of the bronze, the mineralogical and chemical composition of the corrosion layer and soil adhesions, and the technology of manufacture.72 More detailed investigations on the manufacturing technique were published by Berger and colleagues73 including the study of the 0.1–0.4 mm thin gold sheets that had been plated and punched onto the bronze disk, which measures about 32 cm in diameter. The gold inlays have been interpreted as a sun or full moon, a crescent-shaped moon, and 32 stars. Two of the stars were removed and the position of a third was changed when two horizon arches were later attached to the disk, followed by Pernicka, Wunderlich 2002. – Pernicka et al. 2008. – Pernicka 2010. 73 Berger, Schwab, Wunderlich 2010. 72 Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution 35 Fig. 15. Trace elements in ores from the Mitterberg region and in finds from the Nebra hoard (CEZA, Mannheim). 2,12 2,08 208Pb/206Pb 2,04 Mitterberg main lode Mitterberg southern district Mitterberg eastern district Mitterberg copper slag Nebra Sky Disc Nebra hoard 2,00 1,96 1,92 1,88 1,84 0,70 0,72 0,74 0,76 0,78 0,80 0,82 0,84 0,86 207Pb/206Pb Fig. 16. Lead isotope ratios in ores and prehistoric slag from the Mitterberg region compared with the Nebra hoard and the Sky Disk of Nebra (CEZA, Mannheim). the final attachment of a boat or barge.74 The constellation of the gold inlays suggests that the disk initially may have been used for calendrical purposes,75 making the Nebra Sky Disk the earliest astronomical representation of the night sky. The archaeological context of the Sky Disk can be deduced from the accompanying finds in the hoard, which can all be dated to the developed Early Bronze Age in central Europe around 1600 BC, the end of the classical Únětice 74 75 Meller 2010. Schlosser 2003. Culture. This date of burial of the hoard was confirmed by 14 C analyses of a small piece of birch bark found in the handle of a sword. However, the date of manufacture of the Nebra Sky Disk remains unknown due to the lack of a suitable physical method for dating metal objects. The trace element patterns of all objects of the Nebra hoard exhibit an excellent match with the new data of the ores from the Mitterberg (Figs. 15–16). The lead isotope ratios of the metal finds also correspond very well with the slag samples from the Mitterberg area. There is a marginal Ernst Pernicka, Joachim Lutz, Thomas Stöllner 36 208 Pb/206Pb 2,12 2,08 Mitterberg Mitterberg slag Slovakia Valais cp southern Alps 2,04 2,00 0,80 0,82 0,84 0,86 207 Pb/206Pb Fig. 17. Lead isotope ratios of the Mitterberg region (eastern Alps) compared with copper ores from the Hron Valley in Slovakia (Schreiner 2007), Eneolithic copper smelting slags from Trentino and Alto Adige (Artioli et al. 2015) chalcopyrite ores from the Valais in Switzerland (Cattin et al. 2011). The latter two data sets could be further differentiated by the 206Pb/204Pb ratio but this is not relevant in this context (CEZA, Mannheim). systematic difference between the lead isotope ratios of the ores and the slag samples (Tabs. 5–6)76. The reason might be a different lead isotopic signature of additional fluxes used in the smelting process, or the separation of uranium phases and radiogenic lead while processing the ores (milling, washing). Furthermore, the validity of the relationship between copper ores from the Mitterberg region and the Nebra hoard is strongly corroborated by the finding that most copper deposits in Germany and the Czech Republic have different lead isotope ratios as was shown by Frotzscher.77 Recently published results of lead isotope analyses of copper ores from the Valais in Switzerland,78 the Hron Valley in Slovakia79 and the Trentino in Italy80 are also different (Fig. 17). Accordingly, the combination of trace-element pattern and lead isotope ratios of the Mitterberg ores can be considered more or less unique among the copper deposits in central Europe. It is characterised by nickel and arsenic as major impurities that usually occur in roughly equal concentrations and by generally low silver concentrations below 0.05 %. The wider distribution of the Mitterberg copper was investigated by comparing the trace element pattern of the ores with a large database of chemical analyses of prehistoric metal objects in Europe and the Mediterranean region, dating mainly from the early metal ages, i. e. earlier than roughly 1500 BC. The core of this database is formed of the analyses performed at the Württembergisches Landesmuseum in Stuttgart with atomic emission spectrometry,81 to which analyses performed with neutron activation and X-ray fluorescence were added. It was shown that the Stuttgart data are essentially accurate and can, therefore, be pooled and classified together.82 Cluster analysis of some 25,000 datasets based on the element concentrations of As, Sb, Ni, Ag, and Bi has largely confirmed the earlier classification of the Stuttgart team.83 In the present context, this database was used in a different way in that similar patterns in mean values of As, Sb, Ni, and Ag in the objects from the Nebra hoard were searched for. Two search intervals were used. First, the mean values were multiplied by a factor of ± 2, and in a second run by a factor of ± 4 as already successfully applied by Tables 5–6 can be found on pp. 54–55 at the end of this paper. Frotzscher 2009. Cattin et al. 2011. Schreiner 2007. Artioli et al. 2015. 81 Junghans, Sangmeister, Schröder 1960. – Junghans, Sangmeister, Schröder 1968a, b, c. – Junghans, Sangmeister, Schröder 1974. 82 Pernicka 1984. 83 Pernicka 1990. 76 77 78 79 80 Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution 37 Fig. 18. Distribution of metal objects dating to the Early Bronze Age with similar trace element patterns as the Nebra hoard. The size of the symbols relates to the number of objects at each site. The red symbols indicate the smaller search interval and the yellow symbols the larger one (see text for explanation) (CEZA, Mannheim). Klassen and Pernicka.84 The narrow interval represents the rather low precision of the Stuttgart data of around ± 30 % relatively.85 Thus, if the mean value of e.g. arsenic is 0.214 %, then the search interval was between 0.107 and 0.428 % and similarly for the remaining elements. With this interval, objects which had exactly the same trace element pattern as the Nebra hoard (that derived its copper from the Mitterberg region as has been shown above) would be identified. The larger interval allows a difference of a factor of 16 between the lower and upper limit. However, since the trace element concentrations in ore deposits usually range over more than one order of magnitude, this filter would still detect objects that may derive from the same type of copper deposit. The result for roughly contemporary finds to the Nebra hoard is shown in Figure 18. 84 85 Klassen, Pernicka 1998. Pernicka 1984. It may be noted in passing that such a result would not have been possible with the classification method that was suggested by Bray et al.,86 who simply regard the ‘presence’ or ‘absence’ of the elements As, Sb, Ag, Ni as important. As a dividing line, they arbitrarily define a concentration of 0.1 % for all these elements. With this approach, the Mitterberg ores would be divided into two or three different compositional groups. It is interesting that this concept was already unsuccessfully proposed by Richard Pittioni87 who used semiquantitative analyses with a detection limit of about 0.001 % for these elements, which is geochemically and metallurgically more justified. Nevertheless, numerous studies, not least the one by the Stuttgart team themselves, have shown that it is not only worthwhile but essential to use multivariate statistics to extract usable information 86 87 Bray et al. 2015. Pittioni 1959. Ernst Pernicka, Joachim Lutz, Thomas Stöllner 38 LING et al. 2014 fahlore type Inn Valley 2,10 Buchberg raw copper Buchberg ores 208Pb/206Pb 2,06 2,02 1,98 1,94 0,78 0,80 0,82 0,84 0,86 0,88 207Pb/206Pb Fig. 19. Lead isotope ratios of Swedish copper objects with a fahlore signature (Ling et al. 2014) compared with fahlore samples from the Inn Valley between Innsbruck and Brixlegg (Höppner et al. 2005) and copper ores and raw copper from the Early Bronze Age site of Buchberg near Brixlegg (Schubert, Pernicka 2013) (CEZA, Mannheim). from quantitative multi-element analyses. Equally so, the compositional classification by Bray et al.88 does not stand up to the complexity of the data with the simplified yes/no presence of trace-element concentrations and an unsubstantiated threshold arbitrarily set at 0.1 wt % without any geochemical or metallurgical justification. Moreover, it proves the case that classification of continuous data with a discontinuous method is inappropriate and does not advance the scientific interpretation of an existing set of archaeometallurgical data. Last but not least, it is impossible to identify metal recycling patterns with such a method, and in effect the models based on this methodology are producing incorrect patterns of human behaviour. The weakness of this approach is also exemplified by Perucchetti et al.,89 which produced a much more confused distribution of compositionally different Chalcolithic and Bronze Age copper objects from the distribution maps by Junghans et al. and Spindler,90 and practically without any new insights. Although the comparisons are based only on the trace-element patterns, it is evident from Figure 18 that there can be no doubt that the Mitterberg region was an im- 88 89 90 Bray et al. 2015. Perucchetti et al. 2015. Junghans et al. 1968. – Spindler 1971. portant source for copper in prehistoric central Europe. A detailed discussion of this distribution map is still pending but the two large symbols in Hungary east of the Danube and in northwest Romania are the hoards of Hajdúsámson and Apa, which are consistent with Mitterberg copper in their trace element patterns as well as in their lead isotope ratios91 indicating the flow of this metal type from the Alpine piedmont into the Carpathian basin in the east and into western France along the Saone River in the west. A second agglomeration of data points along a route towards the north to southern Scandinavia is also prominent. There are very few lead isotope ratios available for Bronze Age metal objects from this region, but a few dozens were published by Ling and colleagues in 2013 and again with some additional analyses in 201492 together with major and trace element compositions obtained with electron microprobe analysis. The dates of this sample suite range from the Late Neolithic II to Period V according to the relative chronology of northern Europe,93 i. e. from about 2000 to 700 BC in absolute terms. These authors have attempted to identify the ore sources of the prehistoric metal objects 91 92 93 Pernicka 2013. – Pernicka et al. 2016. Ling et al. 2013. – Ling et al. 2014. Kristiansen 1998. 39 Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution 94 95 96 97 98 Ling et al. 2014. Ling et al. 2013. – Ling et al. 2014. Höppner et al. 2005. Höppner et al. 2005. Martinek 1996. – Sydow 1996. – Schubert, Pernicka 2013. fahlore-type copper chalcopyrite copper 100 frequency [%] 80 60 40 Per III Per II 20 0 Bz A2/3 Bz B/C Early Bronze Age Middle Bronze Age Bz A1/2 2000 1600 Bz D Ha A Ha B Late Bronze Age 1200 Ha C/D Early Iron Age 800 BCE 100 80 frequency [%] found in Sweden based only on lead isotope ratios, and came to the conclusion that the majority of the objects derived their copper from Mediterranean sources (southern Iberia, Sardinia, Laurion in Attika, Greece, and Cyprus) but 17 out of 71 objects were attributed to North Tyrol, while Swedish copper ores could be excluded. The problem with such affirmative assignments is that there are many copper mineralisations in such a large area like the whole of Europe and the Mediterranean, so there is bound to exist an overlap of the lead isotope ratios of various ore deposits. It would therefore be necessary to check if the chemical composition of the proposed ore sources were also consistent with such assignments. For the objects related to Brixlegg in North Tyrol it is mentioned that, in addition to matching lead isotope ratios, the objects contain high percentages of silver, arsenic and antimony, i. e. a fahlore signature that resembles the Ösenring copper of the central European Early Bronze Age.94 However, this chemical match is by no means perfect as the Ösenring copper typically also contains 0.1 % Bi, which should be measurable with an electron microprobe. However, this element is not reported. Instead, gold concentrations between 0.01 and 0.12 % are listed in Ling and colleagues in 2013 but not in 2014,95 while Höppner et al.96 did not detect any gold in the Ösenring samples analysed. Moreover, 96 % of about 2700 analyses of Ösenringe in the Stuttgart project contain less than 0.1 % lead, which is corroborated by Höppner et al. who reported less than 0.01 % lead in all the Ösenring samples analysed from Gammersham, Bavaria.97 On the other hand, only two out of sixteen Swedish copper objects with a fahlore signature contain less than 0.1 % Pb, while the others contain between 0.2 and 1.3 % Pb. One rod of lead is even assigned to the Tyrol, although there are no lead deposits in the Inn Valley. There is nevertheless a chance that this type of copper derives from the Tyrol, because there is a match with three ore samples from the Triassic limestone unit, which has been much less investigated than the regional dolomite ores and with copper spills from the Early Bronze Age smelting site at Buchberg in the Inn Valley (Fig. 19).98 If we accept for the moment that copper from central Europe reached Sweden in the second millennium BC, then the question is why this should not also be true for Mitterberg copper, especially because the pattern of metal supply within this period is rather similar in central Europe and 60 40 20 0 LN II + Per I Per II Per III Per IV Per V Fig. 20. – Top: Abundances of copper with fahlore and chalcopyrite signatures produced in the eastern Alps from the beginning of the Bronze Age into the Hallstatt period based on the compositions of some 1200 prehistoric metal artefacts from Tyrol, Salzburg and southern Bavaria. – Bottom: Abundances of copper with fahlore and chalcopyrite signatures in 70 metal artefacts from Sweden (Ling et al. 2014) in roughly the same time range (CEZA, Mannheim). in southern Sweden (Fig. 20). Therefore, one would expect that both metal types could have been supplied from this very active mining region in the Bronze Age. However, only two out of fifteen Swedish copper objects with a chemical signature that matches the Mitterberg ores and the Nebra hoard respectively match the Mitterberg lead isotope signature (Fig. 21). Before accepting the Mediterranean provenance of the Swedish artefacts one should check archaeologically more reasonable possibilities like the Slovakian Ore Mountains that most likely were also exploited for copper in the central European Bronze Age,99 supplied the eastern parts of Austria,100 and certainly also the Carpathian Basin with copper.101 Furthermore, there are typological links between Recently Garner et al. 2014. Duberow, Pernicka, Krenn-Leeb 2009. 101 Pernicka et al. 2016. 99 100 Ernst Pernicka, Joachim Lutz, Thomas Stöllner 40 L��� et al. 2014 Nebra type 2,10 Mitterberg Mitterberg slag 208Pb/206Pb 2,06 2,02 1,98 1,94 1,90 0,70 0,74 0,78 0,82 0,86 0,90 207Pb/206Pb Fig.21. Lead isotope ratios of Swedish copper objects (Ling et al. 2014) with a chemical signature that matches the Mitterberg ores and the Nebra hoard compared with copper ores from the Mitterberg region (CEZA, Mannheim). Fig. 22. Alternative lead isotope diagram to compare the ratios of prehistoric metal objects from southern Sweden (Ling et al. 2014) with copper ores from the Mitterberg region and from the Hron Valley in southern Slovakia (Schreiner 2007) (CEZA, Mannheim). Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution 41 Fig. 23. Concentrations of silver and nickel in prehistoric metal objects from southern Sweden (Ling et al. 2014) compared with copper ores from the Mitterberg region and from the Hron valley in southern Slovakia (Schreiner 2007). The concentration of the ore samples was recalculated assuming that the siderophile and chalcophile elements including copper add up to 100 %. Only ore samples with more than 10 % copper were considered (CEZA, Mannheim). the Carpathian basin and southern Sweden as exemplified by the Apa-type swords102 and the enigmatic objects of Balkåkra and Haschendorf/Hasfalva.103 In Figure 22 all lead isotope ratios of Ling et al.104 are plotted together with copper ores from the Mitterberg region and from the Hron Valley in southern Slovakia.105 The latter are much less radiogenic than the Mitterberg ores and largely overlap with the Swedish metal objects. The chemical composition of the Slovakian copper ores also matches the bulk of the objects (Fig. 23) so that there is no need to postulate a Mediterranean provenance for Bronze Age copper in southern Sweden. In this context it is worthwhile to note that fahlores also occur in the Slovakian Ore Mountains. We may now conclude that low-impurity copper and copper with a fahlore signature reached southern Scandi102 103 104 105 Meller 2010. Pernicka 2010. Ling et al. 2014. Schreiner 2007. navia in periods I and II according to the Nordic chronology, whereby copper from Slovakia seems to predominate. However, the number of analyses is probably too small to draw final conclusions. For the later periods, especially the central European Late Bronze Age coinciding with period III, the situation is substantially complicated by the observation that copper from various sources was apparently mixed. This has long been assumed by the appearance of hoards of broken tools, implements, and fragments of ingots that are commonly interpreted as scrap metal. 9. Conclusion (T. Stöllner, E. Pernicka, J. Lutz) According to the data now available for the ‘Mitterberg’ mining region, there is no doubt that this region was a major producer of copper in Europe during the 18th and 8th centuries BC. Although the importance of Mitterberg was certainly recognised very early on, for a long time there was no possibility to discuss the distribution of this copper in more detail. Better understanding became possible thanks to 42 Ernst Pernicka, Joachim Lutz, Thomas Stöllner extensive analytical programmes on the trace element patterns of Bronze Age metal objects106 that identified a chemically distinct ‘east Alpine copper’ that seemed to derive from chalcopyrite deposits in the Greywacke Zone. But it was not possible to differentiate between various mining sectors. This was, however, necessary to unfold the social dynamics behind the mining, trading and consumption practices resulting in a new quality of discussion. For the first time it is now possible to separate the different east Alpine mining districts according to their lead isotope and trace element characteristics in more detail, particularly those producing copper from chalcopyrite deposits. In comparison with the chemically more distinct fahlore deposits, such copper is more difficult to identify in prehistoric artefacts. Although this achievement still does not exclude other chalcopyrite deposits (Slovakian Ore Mountains, Mediterranean deposits) in general, good arguments can be found to securely identify the Mitterberg deposit copper either in artefacts from central Germany (e.g. the Nebra hoard), from the Alps (e.g. the Piller hoard107 but also from the Carpathian basin like the Apa and the Hajdúsámson hoards.108 It is noteworthy that apart from the east Alpine deposits, the Slovakian Ore Mountains also come into consideration as a source of copper to the Nordic Bronze Age and to Sweden respectively. This has long been suspected by typological studies that seem to suggest a link between the Carpathian basin and southern Scandinavia in the Bronze Age. Therefore, it is not necessary to claim that there was an influx of Mediterranean copper to southern Scandinavia in the Bronze Age. Indeed, most of the published analyses of Scandinavian copper and bronze objects can be attributed to a source from central Europe. Concerning the amount of copper produced at Mitterberg, especially between the 16th and 12th centuries BC, it is not surprising that this mining region dominated the metal exchange of so-called east Alpine copper during the Middle and Early Late Bronze Age, the period of the peak production. It is most likely that the largest part of the estimated overall production was achieved during this time (Fig. 6). Although we still have only a very rough idea about the quantities that were consumed in the key market regions, such as southern Germany and the Middle Danube area, central and northern Germany, and the Carpathian basin, it is obvious that the Mitterberg mines alone could not meet demand in later periods. It is known that the early phases Pittioni 1957. – Pittioni 1959. – Junghans, Sangmeister, Schröder 1968a, b, c. – Junghans, Sangmeister, Schröder 1974. 107 See above and other regional examples such as the hoard from Pass Lueg (Lutz 2011). – See also Stöllner et al. 2016. 108 Pernicka 2013. – Pernicka et al. 2016. 106 of the Late Bronze Age saw the rise of many production regions that mined and processed chalcopyrite and also the fahlores for copper,109 while the Mitterberg mining region began to decline, which as yet cannot be fully explained. As the 14C dates and their correlation with the vegetation history indicates,110 it was probably a slow process with ups and downs even with the opening of new mining fields (Mitterberg eastern lodes) during the Urnfield period111 and the Early Iron Age. It is, however, difficult to trace the Mitterberg copper during this period because of the seemingly regular practice of metal mixing that dominated metal production in the eastern Alps.112 Acknowledgements We would like to thank Michael Brauns, Bernd Höppner and Thorsten Schifer (all Curt-Engelhorn-Zentrum Archäometrie, Mannheim) for carrying out isotope and neutron activation analyses. We are also indebted to Gerhard Tomedi (Universität Innsbruck, Institut für Archäologien) and Walter Stephan (Museum Fliess) for access to prehistoric copper and bronze objects and to Robert Pils (Verein Montandenkmal Arthurstollen, Bischofshofen) and Franz Vavtar (Universität Innsbruck, Institut für Mineralogie und Petrographie) for supporting the field survey and sampling of ores. Mapping and statistical evaluation was supported by Annette Hornschuch and Jona Schröder (DBM); insight into new dendrodates was provided by K. Nicolussi, University of Innsbruck. 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Preuschen, Das urzeitliche Bergbaugebiet von Mühlbach-Bischofshofen. Materialien zur Urgeschichte Österreichs 6, Wien 1932. 47 Ernst Pernicka Curt-Engelhorn-Zentrum Archäometrie D6, 3 68159 Mannheim Germany ernst.pernicka@cez-archaeometrie.de & Institute of Earth Sciences University of Heidelberg Im Neuenheimer Feld 234-236 69120 Heidelberg Germany ernst.pernickageow.uni-heidelberg.de Joachim Lutz Curt-Engelhorn-Zentrum Archäometrie D6, 3 68159 Mannheim Germany joachim.lutz@cez-archaeometrie.de Thomas Stöllner Deutsches Bergbau-Museum Herner Straße 45 44787 Bochum Germany thomas.stoellner@bergbaumuseum.de & Ruhr-University Bochum Institute of Archaeological Studies Pre- and Protohistory Am Bergbaumuseum 31 44791 Bochum thomas.stoellner@rub.de Ernst Pernicka, Joachim Lutz, Thomas Stöllner 48 Tab. 3. Sampling sites and laboratory numbers. Lab no. Field label Location N E MA-080582 Mitterberg 07-1 main lode, Annastollen - - MA-080583 Mitterberg 07-2 Brander lode, Arthurstollen, Nordgang (compressor room) - - MA-080584 MS 1 Brander lode - - MA-080585 MS 4d Brander lode - - MA-080586 MS 6b Brander lode - - MA-080587 MS 7 Brander lode - - MA-080588 MS 8b Brander lode - - MA-080589 MS 9 Brander lode - - MA-081367 MB 12-1 Birkstein lode, Halde Josef-/Ederstollen 47°21.877’ 13°11.249’ MA-081368 MB 12-2 Birkstein lode, Halde Josef-/Ederstollen 47°21.877’ 13°11.249’ MA-081369 MB 12-3 Birkstein lode, Halde Josef-/Ederstollen 47°21.877’ 13°11.249’ MA-081370 MB 12-4 Birkstein lode, Halde Josef-/Ederstollen 47°21.877’ 13°11.249’ MA-081371 MB 12-5 Birkstein lode, Halde Josef-/Ederstollen 47°21.877’ 13°11.249’ MA-081372 MB 12-6 Birkstein lode, Halde Josef-/Ederstollen 47°21.877’ 13°11.249’ MA-081373 MB 12-7 Birkstein lode, Halde Josef-/Ederstollen 47°21.877’ 13°11.249’ MA-081374 MB 12-8 Birkstein lode, Halde Josef-/Ederstollen 47°21.877’ 13°11.249’ MA-081375 MB 12-9 Birkstein lode, Halde Josef-/Ederstollen 47°21.877’ 13°11.249’ MA-081376 MB 12-10 Birkstein lode, Halde Josef-/Ederstollen 47°21.877’ 13°11.249’ MA-081377 MB 13 Brander lode, Arthurstollen, Südgang (Stollenmeter 502) - - MA-081378 MB 14 Brander lode, Arthurstollen, Nordgang (Stollenmeter 490) - - MA-081379 MB 15 Brander lode, Arthurstollen, Nordgang (Stollenmeter 946) - - MA-081380 MB 16 Brander lode, Arthurstollen, Nordgang (compressor room) - - MA-081381 MB 17-1 Brander lode, Arthurstollen, Nordgang (Tiefbau) - - MA-081382 MB 17-2 Brander lode, Arthurstollen, Nordgang (Tiefbau) - - MA-081383 MB 23 Brander lode, Höchstollen - - MA-081384 MB 24 Brander lode, Arthurstollen - - MA-081385 MB 1-1 main lode, mining dump Annastollen 47°24.546’ 13°08.666’ MA-081386 MB 1-2 main lode, mining dump Annastollen 47°24.546’ 13°08.666’ MA-081387 MB 1-3 main lode, mining dump Annastollen 47°24.546’ 13°08.666’ MA-081388 MB 1-4 main lode, mining dump Annastollen 47°24.546’ 13°08.666’ MA-081389 MB 1-5 main lode, mining dump Annastollen 47°24.546’ 13°08.666’ MA-081390 MB 1-6 main lode, mining dump Annastollen 47°24.546’ 13°08.666’ MA-081391 MB 1-7 main lode, mining dump Annastollen 47°24.546’ 13°08.666’ MA-081392 MB 1-8 main lode, mining dump Annastollen 47°24.546’ 13°08.666’ MA-081393 MB 2-1 main lode, mining dump Danielstollen 47°24.696’ 13°09.009’ MA-081394 MB 2-2 main lode, mining dump Danielstollen 47°24.696’ 13°09.009’ MA-081395 MB 2-3 main lode, mining dump Danielstollen 47°24.696’ 13°09.009’ MA-081396 MB 2-4 main lode, mining dump Danielstollen 47°24.696’ 13°09.009’ MA-081397 MB 2-5 main lode, mining dump Danielstollen 47°24.696’ 13°09.009’ MA-081398 MB 2-6 main lode, mining dump Danielstollen 47°24.696’ 13°09.009’ MA-081399 MB 18 Winkel lode, mining dump Im Naglgraben 47°23.680’ 13°14.583’ MA-081400 MB 19 Winkel lode, mining dump 47°23.682’ 13°14.683’ MA-081401 MB 20-1 Burgschwaig lode, mining dump Oberer Palfner-Schurfstollen 47°22.792’ 13°10.561’ MA-081402 MB 20-2 Burgschwaig lode, mining dump Oberer Palfner-Schurfstollen 47°22.792’ 13°10.561’ 49 Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution Tab. 3. continued. Lab no. Field label Location MA-081403 MB 20-3 MA-081404 MB 20-4 MA-081405 N E Burgschwaig lode, mining dump Oberer Palfner-Schurfstollen 47°22.792’ 13°10.561’ Burgschwaig lode, mining dump Oberer Palfner-Schurfstollen 47°22.792’ 13°10.561’ MB 21-1 Buchberg lode, mining dump Oberer Buchbergstollen 47°24.327’ 13°14.339’ MA-081406 MB 21-2 Buchberg lode, mining dump Oberer Buchbergstollen 47°24.327’ 13°14.339’ MA-081407 MB 21-3 Buchberg lode, mining dump Oberer Buchbergstollen 47°24.327’ 13°14.339’ MA-081408 MB 21-4 Buchberg lode, mining dump Oberer Buchbergstollen 47°24.327’ 13°14.339’ MA-081409 MB 7-1 main lode, stream bed near Maria-Hilf-Stollen 47°24.165’ 13°07.207’ MA-081410 MB 7-2 main lode, stream bed near Maria-Hilf-Stollen 47°24.165’ 13°07.207’ MA-081411 MB 7-3 main lode, stream bed near Maria-Hilf-Stollen 47°24.165’ 13°07.207’ MA-081412 MB 7-4 main lode, stream bed near Maria-Hilf-Stollen 47°24.165’ 13°07.207’ MA-081413 MB 7-5 main lode, stream bed near Maria-Hilf-Stollen 47°24.165’ 13°07.207’ MA-081414 MB 7-6 main lode, stream bed near Maria-Hilf-Stollen 47°24.165’ 13°07.207’ MA-081415 MB 7-7 main lode, stream bed near Maria-Hilf-Stollen 47°24.165’ 13°07.207’ MA-081416 MB 7-8 main lode, stream bed near Maria-Hilf-Stollen 47°24.165’ 13°07.207’ MA-081417 MB 9-1 main lode, stream bed near Josefi-Oberbau-Stollen - - MA-081418 MB 9-2 main lode, stream bed near Josefi-Oberbau-Stollen - - MA-081419 MB 9-3 main lode, stream bed near Josefi-Oberbau-Stollen - - MA-081420 MB 9-4 main lode, stream bed near Josefi-Oberbau-Stollen - - MA-081421 MB 9-5 main lode, stream bed near Josefi-Oberbau-Stollen - - MA-081422 MB 9-6 main lode, stream bed near Josefi-Oberbau-Stollen - - MA-081423 MB-10 main lode, stream bed beside Maria-Hilf-Stollen 47°24.407’ 13°07.423’ MA-081424 MB 11-1 main lode, streambed near Josefi-Unterbau-Stollen - - MA-081425 MB 11-2 main lode, streambed near Josefi-Unterbau-Stollen - - MA-081426 MB 11-3 main lode, streambed near Josefi-Unterbau-Stollen - - MA-081427 MB 11-4 main lode, streambed near Josefi-Unterbau-Stollen - - MA-081428 MB 11-5 main lode, streambed near Josefi-Unterbau-Stollen - - MA-081429 MB 11-6 main lode, streambed near Josefi-Unterbau-Stollen - - MA-081430 MB 11-7 main lode, streambed near Josefi-Unterbau-Stollen - - MA-081624 MB 21-5 Buchberg lode, mining dump Oberer Buchbergstollen 47°24.327’ 13°14.339’ MA-081625 MB 21-6 Buchberg lode, mining dump Oberer Buchbergstollen 47°24.327’ 13°14.339’ MA-081626 MB 19-2 Winkel lode, dump beside test trench 47°23.682’ 13°14.683’ MA-081627 MB 19-3 Winkel lode, dump beside test trench 47°23.682’ 13°14.683’ MA-081628 MB 26-1 Burgschwaig lode, mining dump Luisenstollen 47°22.216’ 13°11.279’ MA-081629 MB 26-2 Burgschwaig lode, mining dump Luisenstollen 47°22.216’ 13°11.279’ MA-081630 MB 26-3 Burgschwaig lode, mining dump Luisenstollen 47°22.216’ 13°11.279’ MA-081631 MB 26-4 Burgschwaig lode, mining dump Luisenstollen 47°22.216’ 13°11.279’ MA-081632 MB 26-5 Burgschwaig lode, mining dump Luisenstollen 47°22.216’ 13°11.279’ MA-081633 MB 26-6 Burgschwaig lode, mining dump Luisenstollen 47°22.216’ 13°11.279’ MA-081634 MB 25-1 Taghaube 47°23.905’ 13°03.674’ MA-081635 MB 25-2 Taghaube 47°23.905’ 13°03.674’ MA-100344 MB 9-1-1 Buchberg lode - - MA-100345 MB 9-1-2 Buchberg lode - - MA-100346 MB 9-1-3 Buchberg lode - - MA-100347 MB-9-1-4 Buchberg lode - - Ernst Pernicka, Joachim Lutz, Thomas Stöllner 50 Tab. 3. continued. Lab no. Field label Location N E MA-100348 MB- 9-1-5 Buchberg lode - - MA-100349 MB 9-2-1 Winkel lode, prehistoric dump - - MA-100350 MB 9-2-2 Winkel lode, prehistoric dump - - MA-100351 MB 9-3-1 Winkel lode, mining dump Arzbergstollen - - MA-100352 MB 9-3-2 Winkel lode, mining dump Arzbergstollen - - MA-100353 MB 9-3-3 Winkel lode, mining dump Arzbergstollen - - MA-100354 MB 9-3-4 Winkel lode, mining dump Arzbergstollen - - MA-100355 Vieh-1-1 Viehhofen, prehistoric mining dump north of Viehhofen - - MA-100356 Vieh-1-2 Viehhofen, prehistoric mining dump north of Viehhofen - - MA-100357 Vieh-1-3 Viehhofen, prehistoric mining dump north of Viehhofen - - MA-100358 Vieh-1-4 Viehhofen, prehistoric mining dump north of Viehhofen - - MA-100359 Vieh-2-1 Viehhofen, quarry east of Viehhofen - - MA-080975 KE 1 Kitzbühel-Jochberg, Kelchalm - - MA-080976 KE 2 Kitzbühel-Jochberg, Kelchalm - - MA-080979 KE 27 Kitzbühel-Jochberg, Kelchalm - - MA-080981 KE 28 Kitzbühel-Jochberg, Kelchalm - - MA-080980 KE 28a Kitzbühel-Jochberg, Kelchalm - - MA-080977 KE 3 Kitzbühel-Jochberg, Kelchalm - - MA-080982 KE 32 Kitzbühel-Jochberg, Kelchalm - - MA-080983 KE 34 Kitzbühel-Jochberg, Kelchalm - - MA-080984 KE 35 Kitzbühel-Jochberg, Kelchalm - - MA-080985 KE 43 Kitzbühel-Jochberg, Kelchalm - - MA-080978 KE 5 Kitzbühel-Jochberg, Kelchalm - - MA-081637 KE 6 Kitzbühel-Jochberg, Kelchalm - - MA-081638 KES 7 Kitzbühel-Jochberg, Kelchalm - - MA-081639 KE 43a Kitzbühel-Jochberg, Kelchalm - - MA-080989 KP 1 Kitzbühel-Jochberg, Kupferplatte - - 51 Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution Tab. 4. Element concentrations in ore samples from the Mitterberg region as determined by instrumental neutron activation analysis (Cu, Fe, As, Sb, Co, Ni, Ag, Au, Zn, Sn, Se, Te) and inductively coupled mass spectrometry (Pb, Bi); n.a. = not analysed; < = below detection limit. Lab no. Cu Fe As Sb Co Ni Ag Au Zn Sn Se Te Pb Bi % % μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g MA-080582 22.8 16.0 291 16.3 8.2 124 6.6 0.12 89 < 110 5 <6 24.4 25.0 MA-080583 15.3 23.6 3800 40 890 2330 10.1 0.20 156 < 109 47 13 27.2 35 MA-080584 28.1 21.5 1340 1340 241 1250 10.1 0.53 930 < 100 43 8 13.0 10.4 MA-080585 7.0 21.2 8400 40 630 1040 4.4 0.29 89 < 66 37 8 32 19.4 MA-080586 7.2 12.6 1690 201 660 840 7.5 0.17 190 44 20 < 15 15.3 13.6 MA-080587 11.4 18.3 1590 17.3 450 1050 5.9 0.40 119 < 148 23 <9 20.8 13.6 MA-080588 18.7 19.0 3000 57 720 1480 13.5 0.24 219 < 69 32 < 12 18.0 18.1 MA-080589 7.8 9.5 2780 120 1090 880 6.0 1.04 136 < 215 25 10 10.7 25.2 MA-081367 20.1 14.8 63 7.0 1.50 < 150 12.4 0.05 85 < 89 2.4 <6 4.1 0.18 MA-081368 22.5 17.1 69 9.6 6.5 < 159 14.5 0.15 89 < 77 4.6 <7 3.1 0.26 MA-081369 25.0 17.6 33 26.2 2.71 104 14.1 0.11 255 < 207 7.3 3 7.2 0.32 MA-081370 20.0 19.1 440 29.8 69 153 20.4 0.20 82 < 248 7.9 <9 12.8 1.73 MA-081371 16.0 24.9 720 207 66 235 16.1 0.46 99 40 8.0 < 10 n.a. n.a. MA-081372 30 20.9 141 49 15.1 < 152 19.4 0.14 650 < 105 37 5 23.5 0.51 MA-081373 25.0 18.4 134 24.7 15.5 92 19.1 0.23 330 32 7.6 <8 5.8 0.61 MA-081374 17.3 22.4 420 27.6 81 < 179 5.2 0.25 139 41 7.6 <9 n.a. n.a. MA-081375 27.3 15.2 55 9.7 5.9 86 10.7 0.17 188 35 5.9 5 11.9 0.39 MA-081376 21.9 12.7 86 11.8 13.0 142 21.6 0.30 60 < 60 4.9 <8 n.a. n.a. MA-081377 33 17.8 5.9 3.9 41 350 47 0.10 1810 146 25.7 4 12.1 0.21 MA-081378 10.2 12.6 17000 156 770 13000 17.1 0.34 254 < 140 16.8 < 30 12.0 2.12 MA-081379 8.9 10.2 1440 39 264 2760 11.1 0.16 75 < 207 14.2 6 21.2 1.84 MA-081380 28.6 17.4 480 27.4 162 910 14.0 0.37 271 < 216 44 <9 61 1.76 MA-081381 13.7 22.5 660 135 520 1030 6.4 0.90 118 48 65 5 59 5.6 MA-081382 20.2 14.5 1180 124 320 780 10.2 0.61 420 40 34 < 13 n.a. n.a. MA-081383 3.0 19.0 610 9.3 1770 2210 3.1 0.14 400 < 530 18.3 < 41 6.9 2.14 MA-081384 15.7 11.7 1870 490 450 1380 20.8 0.32 171 < 300 28.4 < 20 58 9.6 MA-081385 22.6 15.4 800 12.1 35 630 13.7 0.14 99 < 154 12.4 < 11 8.4 0.57 MA-081386 16.2 13.9 300 8.2 58 233 3.0 0.08 72 < 65 14.3 <9 10.5 1.45 MA-081387 19.8 16.6 216 11.8 64 225 6.3 0.07 270 < 112 21.8 < 10 n.a. n.a. MA-081388 17.6 11.7 820 27.8 7.2 490 5.4 0.35 64 < 34 10.5 3 n.a. n.a. MA-081389 21.1 14.4 3900 20.3 59 1950 23.2 0.18 570 85 12.4 10 32 1.27 MA-081390 26.9 18.2 3400 23.8 61 2320 7.9 0.31 77 58 19.6 < 14 11.4 1.16 MA-081391 20.8 19.0 11000 58 224 8000 3.7 0.40 60 < 205 15.0 < 17 23.3 4.6 MA-081392 19.6 15.7 1550 28.8 116 1070 6.7 0.17 200 < 168 17.8 13 96 2.33 MA-081393 22.6 21.2 410 7.9 53 143 8.4 0.15 121 62 8.8 15 n.a. n.a. MA-081394 19.7 27.8 610 4.2 850 1010 10.0 0.79 53 201 36 < 27 9.3 12.4 MA-081395 17.9 19.7 132 20.7 18.2 161 7.6 0.09 203 < 320 16.5 < 21 9.4 1.45 MA-081396 30 27.5 20200 138 22.0 1360 32 0.24 3800 < 390 11.4 < 26 300 2.13 MA-081397 12.8 14.4 13200 76 219 9100 16.4 0.64 74 74 17.4 < 21 n.a. n.a. MA-081398 9.5 15.7 650 72 285 490 8.6 0.16 259 < 330 9.0 < 25 n.a. n.a. MA-081399 8.5 10.4 370 202 51 223 9.2 1.24 67 < 223 66 78 69 1310 MA-081400 17.6 0.50 360 1.84 330 87 <3 < 0.1 62 53 4.9 7 n.a. n.a. Ernst Pernicka, Joachim Lutz, Thomas Stöllner 52 Tab. 4. continued. Lab no. Cu Fe As Sb Co Ni Ag Au Zn Sn Se Te Pb Bi % % μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g MA-081401 17.5 17.5 1050 14.1 95 910 21.2 0.14 262 < 130 12.0 4 5.5 0.22 MA-081402 10.3 19.6 1830 22.8 670 1960 12.7 0.19 106 < 99 13.1 6 13.9 1.06 MA-081403 25.8 19.4 254 8.4 34 1700 36 0.27 480 < 81 15.5 4 8.8 0.13 MA-081404 12.8 18.3 1510 16.0 350 1670 16.7 0.16 220 < 139 12.6 7 n.a. n.a. MA-081405 9.4 8.0 310 19.2 230 274 15.9 0.64 1050 42 6.3 5 134 1.41 MA-081406 2.36 16.7 320 31 290 215 4 0.12 14.8 56 4.4 <7 18.6 9.6 MA-081407 4.2 19.4 148 8.7 410 480 <2 0.09 68 < 200 13.6 < 10 n.a. n.a. MA-081408 12.3 8.6 271 10.8 18.2 < 117 13.2 0.06 400 < 58 3.9 5 19.7 0.47 MA-081409 33 17.4 3300 13.1 103 1510 10.3 0.57 277 117 9.1 <6 42 3.2 MA-081410 16.8 16.2 650 46 137 1200 7.5 0.15 18.8 89 9.2 <6 n.a. n.a. MA-081411 21.8 15.8 9300 71 147 6100 20.1 0.81 205 55 18.4 <7 n.a. n.a. MA-081412 24.5 14.0 1160 197 71 510 6.4 0.09 130 < 202 26.3 <8 n.a. n.a. MA-081413 21.1 14.0 14600 68 287 8100 17.2 0.23 164 40 15.6 <8 n.a. n.a. MA-081414 23.8 14.0 4700 38 89 2030 9.3 0.52 420 93 7.8 4 n.a. n.a. MA-081415 21.9 12.4 4600 35 109 2560 11.4 0.39 132 35 6.1 <7 n.a. n.a. MA-081416 14.3 18.4 1910 28.9 39 1220 8.4 0.48 51 < 34 10.3 <7 n.a. n.a. MA-081417 19.2 14.0 310 47 18.7 520 6.0 0.19 31 < 297 < 10 < 13 n.a. n.a. MA-081418 10.2 18.9 1290 95 112 219 <4 < 0.1 31 < 440 21.4 < 20 9.0 2.21 MA-081419 22.6 14.2 38 47 59 48 8.3 0.07 25.5 < 123 13.0 6 n.a. n.a. MA-081420 16.2 8.1 330 32 11.4 310 4.9 0.14 25.1 < 276 4.6 6 n.a. n.a. MA-081421 5.0 21.1 3600 3300 191 390 65 0.18 640 < 710 23.4 < 27 n.a. n.a. MA-081422 19.9 25.9 1220 80 141 1190 12.8 0.18 155 126 16.8 <7 n.a. n.a. MA-081423 20.0 20.2 3100 11.1 85 1450 6.6 0.43 62 53 2.2 <6 7.6 3.8 MA-081424 19.6 17.9 13200 66 320 6600 8.5 0.12 115 32 25.2 <9 n.a. n.a. MA-081425 19.0 17.6 119 17.3 21.1 < 173 21.8 0.04 158 < 156 13.1 < 11 n.a. n.a. MA-081426 29.7 18.4 650 27.0 9.9 400 < 10 0.15 198 < 330 14.8 14 n.a. n.a. MA-081427 21.3 13.4 3500 153 65 1530 17.4 0.21 284 < 340 9.6 < 13 n.a. n.a. MA-081428 21.1 18.5 196 32 147 278 <2 0.15 32 < 68 22.2 <9 49 1.34 MA-081429 13.5 12.6 11400 94 173 7800 17.5 0.71 78 < 340 16.4 < 13 n.a. n.a. MA-081430 27.8 17.8 1930 23.7 77 1400 15.6 0.15 < 21 < 310 11.1 < 14 n.a. n.a. MA-081624 13.5 17.4 480 18.8 370 720 7.9 0.13 217 < 37 4.9 3 25.5 2.21 MA-081625 9.4 8.5 88 5.2 59 262 5.0 0.15 125 < 108 2.1 <5 9.3 0.55 MA-081626 4.5 3.5 222 44 6.5 24 2.8 0.06 23.0 17 20.3 <5 2.66 1.15 MA-081627 8.0 5.6 330 4.8 5.9 22 9.6 0.09 108 24 19.8 1 52 0.80 MA-081628 19.7 12.9 7.7 11.1 15.9 500 7.4 0.16 136 < 122 10.6 <6 43 0.11 MA-081629 19.0 13.9 1670 12.9 279 2070 13.4 0.21 380 < 153 8.4 <8 32 1.60 MA-081630 14.0 11.5 1850 23.4 360 9100 10.0 0.16 200 27 5.3 7 28.0 1.14 MA-081631 22.7 15.5 145 6.9 115 9200 6.5 0.11 100 < 47 2.5 <1 17.9 0.78 MA-081632 10.2 14.0 55 11.0 260 12600 11.4 0.05 31 < 330 5.3 < 14 n.a. n.a. MA-081633 18.1 15.9 280 28.3 73 6300 11.3 0.06 37 320 3.7 < 13 7.1 0.26 MA-081634 14.0 31 370 530 102 271 34 0.06 68 < 470 13.2 < 21 5.5 1.79 MA-081635 12.8 33 400 340 212 740 21.9 0.09 60 < 390 13.9 < 18 14.4 4.2 53 Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution Tab. 4. continued. Lab no. Cu Fe As Sb Co Ni Ag Au Zn Sn Se Te Pb Bi % % μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g μg/g MA-100344 3.7 8.2 51 8.4 67 50 4.8 0.02 40 < 35 2.2 <7 5.4 0.6 MA-100345 6.1 10.5 69 2.35 155 130 7 0.06 124 < 130 2.4 2 5.6 0.3 MA-100346 4.5 12.5 211 4.7 186 200 6.4 0.137 64 < 130 3.2 <7 7.0 1.6 MA-100347 7.0 10.9 151 3.6 16.4 50 4.6 0.029 140 < 58 2.5 <7 4.5 0.1 MA-100348 11.7 12.2 77 3.7 48 60 7.7 0.03 194 < 120 3 <7 8.8 0.5 MA-100349 11.3 10.8 650 85 100 50 10.5 0.095 147 < 120 52 <8 136 3.9 MA-100350 5.9 6.6 360 10.6 23 110 8.8 0.144 90 < 34 32 3 10.5 2.4 MA-100351 27.8 25.0 650 25.7 61 360 62 1.7 2040 80 20.6 <9 40 6.3 MA-100352 3.4 9.7 66000 144 1160 90 13.6 < 0.2 180 < 81 18.7 < 16 23.8 23.4 MA-100353 6.6 9.1 1190 16.6 175 90 6.5 0.11 239 < 150 19 < 10 7.1 2.0 MA-100354 5.1 4.3 1840 6.8 127 60 11.3 0.13 160 < 110 15.2 6 5.5 4.8 MA-100355 7.1 12.5 620 15.6 220 510 16.7 0.168 44 60 18.5 <9 24.2 1.5 MA-100356 5.0 8.1 470 7.8 146 420 8.4 0.085 34 < 110 35 <8 13.7 1.8 MA-100357 5.4 8.8 490 6.7 127 440 9.7 0.08 27 < 47 29.8 <9 13.5 2.2 MA-100358 6.9 6.6 144 3.8 35 110 11.9 0.032 28 < 100 10.5 3 8.2 0.5 MA-100359 47 16.4 540 7.6 300 1260 9 0.15 71 < 150 145 < 12 14.2 1.8 MA-080975 16.6 9.9 370 10.9 148 224 23.4 0.15 91 < 125 14 6 13.1 20.6 MA-080976 27.7 15.5 4.0 5.6 4.7 48 12.9 0.12 48 < 60 133 4 21.8 12.2 MA-080979 12.5 18.3 17.4 7.1 155 750 4.1 0.41 15 < 68 139 10 30 51 MA-080981 14.6 13.6 98 8.2 77 283 5.5 0.21 12 < 159 110 < 16 31 25.1 MA-080980 20.9 14.2 6.3 3.5 34 252 5.3 0.34 22 143 116 <8 20.9 29.3 MA-080977 8.3 6.9 6.2 3.1 54 112 7.2 0.04 56 < 64 45 < 10 12.5 8.4 MA-080982 14.7 16.2 280 9.0 185 450 5.6 0.94 1160 58 133 < 16 123 122 MA-080983 12.9 13.2 134 11.2 149 291 4.0 0.32 33 < 74 66 10 33 58 MA-080984 14.0 11.0 141 6.5 79 230 5.3 0.26 111 < 67 82 < 13 180 75 MA-080985 27.4 14.6 63 4.6 53 < 74 12.3 0.19 43 < 66 145 7 19.0 17.7 MA-080978 25.3 14.1 4.0 6.5 5.5 91 9.2 0.13 44 43 109 7 13.7 9.8 MA-081637 11.7 10.1 74 5.9 42 < 132 4.5 0.16 51 < 231 58 11 n.d. n.d. MA-081638 21.0 19.9 105 9.1 138 200 13.1 0.32 262 < 320 119 < 17 n.d. n.d. MA-081639 23.3 7.2 13.6 1.93 4.8 < 99 3.9 0.12 15.6 < 222 23.8 6 n.d. n.d. MA-080989 31 16.6 94 11.3 40 < 106 36 0.10 112 99 17 51 36 12.8 Ernst Pernicka, Joachim Lutz, Thomas Stöllner 54 Tab. 5. Lead isotope ratios in ore samples from the Mitterberg region as determined by multi collector inductively coupled mass spectrometry. The precision of measurement is less than ± 0.01 % for ratios with 206Pb in the denominator and up to ± 0.03 % for 206Pb/204Pb. Lab no. 208 Pb/206Pb 207 Pb/206Pb 206 Pb/204Pb Lab no. 208 Pb/206Pb 207 Pb/206Pb 206 Pb/204Pb MA-080582 1.9506 0.76286 20.697 MA-081428 1.9820 0.77842 20.248 MA-080583 2.0247 0.80003 19.668 MA-081624 2.0718 0.82074 19.125 MA-080584 2.0406 0.80960 19.415 MA-081625 2.0729 0.82271 19.073 MA-080585 2.0342 0.80424 19.558 MA-081626 2.0893 0.83261 18.859 MA-080586 2.0378 0.80788 19.458 MA-081627 2.0966 0.83710 18.754 MA-080587 2.0172 0.79758 19.730 MA-081628 2.0503 0.81326 19.321 MA-080588 2.0388 0.80836 19.447 MA-081629 2.0478 0.80931 19.428 MA-080589 2.0406 0.80944 19.427 MA-081630 2.0435 0.80563 19.522 MA-081367 1.9894 0.78407 20.101 MA-081631 2.0357 0.79888 19.691 MA-081368 2.0396 0.82366 19.031 MA-081633 2.0637 0.82175 19.097 MA-081369 1.9462 0.76366 20.678 MA-081634 2.0223 0.80523 19.531 MA-081370 1.9968 0.79159 19.894 MA-081635 2.0031 0.7961 19.765 MA-081372 1.9926 0.78955 19.944 MA-100344 2.0764 0.81741 19.208 MA-081373 2.0334 0.80943 19.415 MA-100345 2.0692 0.81256 19.329 MA-081375 2.0468 0.83419 18.766 MA-100346 2.0657 0.81928 19.160 MA-081377 2.0320 0.79670 19.733 MA-100347 2.0727 0.82506 19.010 MA-081378 1.9006 0.69971 22.697 MA-100348 2.0590 0.81526 19.254 MA-081379 2.0249 0.79952 19.678 MA-100349 2.0978 0.83376 18.839 MA-081380 2.0259 0.79932 19.678 MA-100350 2.0731 0.82934 18.926 MA-081381 2.0394 0.80662 19.494 MA-100351 2.0002 0.77276 20.422 MA-081383 2.0267 0.80010 19.665 MA-100352 2.0401 0.79974 19.693 MA-081384 2.0154 0.79152 19.890 MA-100353 2.0663 0.81755 19.233 MA-081385 1.9938 0.78264 20.137 MA-100354 2.0484 0.80517 19.546 MA-081386 1.9429 0.76350 20.671 MA-100355 2.0926 0.84995 18.430 MA-081389 1.9067 0.73051 21.683 MA-100356 2.0818 0.83608 18.768 MA-081390 1.9862 0.77856 20.249 MA-100357 2.0681 0.82343 19.074 MA-081391 2.0082 0.79452 19.802 MA-100358 2.0857 0.83905 18.693 MA-081392 1.9560 0.76591 20.612 MA-100359 2.0822 0.84040 18.658 MA-081394 2.0027 0.78665 20.036 MA-080975 2.0522 0.83268 18.829 MA-081395 1.9447 0.75977 20.785 MA-080976 2.0964 0.82880 18.922 MA-081396 1.9264 0.73940 21.403 MA-080979 2.0910 0.81932 19.202 MA-081399 2.0194 0.78796 20.016 MA-080981 2.0976 0.80315 19.615 MA-081401 2.0564 0.81530 19.268 MA-080980 2.0880 0.81619 19.277 MA-081402 2.0536 0.81252 19.345 MA-080977 2.0814 0.83662 18.750 MA-081403 2.0443 0.80595 19.507 MA-080982 2.0975 0.80686 19.495 MA-081405 2.0672 0.82328 19.057 MA-080983 2.0978 0.80582 19.546 MA-081406 2.0753 0.81997 19.152 MA-080984 2.0997 0.80650 19.540 MA-081408 2.0726 0.82894 18.918 MA-080985 2.0987 0.82929 18.948 MA-081409 2.0468 0.81917 19.174 MA-080978 2.0904 0.83580 18.791 MA-081418 1.8825 0.72733 21.771 MA-080989 1.6772 0.68406 23.248 MA-081423 1.9549 0.76661 20.584 Bronze Age Copper Produced at Mitterberg, Austria, and its Distribution Tab. 6. Lead isotope ratios in slag samples from different slag heaps as determined by multi collector inductively coupled mass spectrometry. The precision of measurement is less than ± 0.01 % for ratios with 206Pb in the denominator and up to ± 0.03 % for 206Pb/204Pb. Lab no. Location MA-091529 SP AA Widersberg-Alp. Schlacke am Bach 208 Pb/206Pb 2.0155 207 Pb/206Pb 0.80029 206 Pb/204Pb 19.655 MA-091530 SP 04 Widersberg-Alp 1.9839 0.78589 20.032 MA-091531 SP 06 Dientner Sattel 2.0187 0.80220 19.609 MA-091532 SP 07 Dientner Sattel 2.0157 0.80228 19.602 MA-091533 SP 09 Dientner Sattel 2.0144 0.80139 19.629 MA-091534 SP 12 Widersberg-Alp 2.0108 0.79691 19.749 MA-091536 SP 13 S-Teil Widersberg-Alp 2.0018 0.79448 19.813 MA-091537 SP 14 Widersberg-Alp 2.0082 0.79958 19.671 MA-091538 SP 14A Widersberg-Alp 2.0257 0.80679 19.482 MA-091539 SP 15-1 Widersberg-Alp. Kopphütte 2.0013 0.79688 19.735 MA-091540 SP 15-2 Widersberg-Alp. Kopphütte 2.0570 0.83214 18.822 MA-091541 SP 16 Kopphütte 2.0213 0.80571 19.509 MA-091542 SP 22 Windrauchegg 2.0251 0.80753 19.468 MA-091543 SP 23 Hochkeil 2.0252 0.80715 19.475 MA-091544 SP 40 Widersberg-Alp 1.9914 0.78976 19.936 MA-091545 SP 47 Hochkeil 1.9808 0.78415 20.089 MA-091546 SP 59-1 Burgschwaig 2.0496 0.82282 19.065 MA-091547 SP 59-2 Burgschwaig 2.0105 0.78117 20.179 MA-091548 SP 64 Winklgang 2.0533 0.81656 19.226 MA-091549 MB 08-03 Hauptgang Nähe Danielstollen 2.0208 0.80518 19.527 MA-091550 MB 08-22/1 Buchberg 2.0722 0.83483 18.777 MA-091551 MB 08-22/2 Buchberg 2.0933 0.84738 18.480 55