This article, dedicated to the memory of the late Prof. John H. Kroll, focuses on late fifth century BCE Athenian-style tetradrachms found in the southern Levant, to shed new light on whether they are genuine Athenian issues or local imitations. To address this important yet vexed historical question, we analysed the Pb isotope compositions of 22 coins from ten controlled archaeological excavations in Israel and compared them against the similar to 7,000 galena samples in the Lyon Pb isotope database. Nineteen of the coins are of the "three-quarter profile eye" variety conventionally dated mid to late fifth century BCE. We found that they match Attic or Athenian-controlled silver sources, suggesting they are authentic Athenian issues and not imitations as some of them were originally categorised. We argue that these coins likely entered the Western Asian money supply during Athens' massive naval campaigns in the eastern Aegean in the third and final phase of the Peloponnesian War, and that the series should be refined to end with the city's defeat and loss of silver sources in 404 BCE. The fact that three of the coins are plated supports the contention that they were part of the series minted when Athens was under extreme financial duress. The remaining two coins are of the pi-style series struck in the early 340 s BCE, as proposed by John H. Kroll (personal communication and cf. also Flament, 2023). The Pb isotope data indicate that our examples were not struck from Athenian silver casting doubt on the current theory that they were restruck Attic coins. These overall findings call for a reassessment of monetary sources, coin circulation, and local minting in the fourth century BCE in the southern Levant. This study also highlights the need for independent archaeological dating beyond reliance upon numismatic typology.

This study addresses longstanding questions concerning the ore sources used in the first series of coins of ancient Athens known as the Wappenmϋnzen (c.540-c.500 BCE) by combining comprehensive numismatic data on 22 coins (16 new and 6 legacy analyses) with lead isotope and surface elemental measurements (MC-ICP-MS and XRF). It finds usage of ores from Spain to Romania and Türkiye and frequent mixing. This upends current thinking based on a (mis)interpretation of historical sources which argues that the tyrant Peisistratos and his sons, who ruled Athens during the period, sourced most silver from the districts of Mt Pangaion and Strymon River in northern Greece and that silver did not flow from the western Mediterranean into their coinage. The data suggest that domestic ‘Lavrion’ mines of Athens did not contribute to the ore stock of the Wappenmϋnzen until the subsequent production of the ‘owl’ series when it was also used in some Wappenmϋnzen fractions and show that there is no correlation between coin types and ore sources. Elemental compositions nuance our understanding of the coins, but do not shed light on provenance. Together, these new findings force a reappraisal of numismatic and historical perceptions of the period of the Athenian tyranny in the lead up to democracy, not least because the multiple silver sources point to trading relationships with a greater variety of regions than previously contemplated.

Late in the sixth century BCE, the ancient Athenians overthrew the previous tyrant rulers and adopted a new democratic form of government militarily establishing themselves as a regional power. They constructed a fleet which played a crucial role in defeating the Persian invasion of 480/79 BCE and led to their creation of a naval-based empire. A key funding source for the ships was silver from the domestic mines at Lavrion situated in the south-east corner of Attica (Hdt. 7.144; Ath. Pol. 22.7). The current consensus based on earlier metal analysis is that the Athenians must have found and exploited the rich, so-called ‘third contact’ silver mines in 520–515 BCE, a discovery that led to the introduction of the larger tetradrachm monetary unit (Kraay, 1956) and the iconic ‘owl’ coin ‘type’ (Picard, 2001) as a branded medium for exporting silver. Here, we present new lead isotopic and elemental abundance data for 52 archaic Athenian owls (pre-479 BCE) combined with previously published legacy data for 12 other owls. The results show that only a small proportion of the coins were wholly struck from Lavrion ore or other discrete sources while most of the coins were struck from Lavrion ore mixed with ore from a single or homogeneous, geologically older source. Crucially, this was not the multitude of external sources used for the preceding Wappenmünzen series. We deduce that the discovery of the third contact only occurred shortly before 483/2 BCE, precisely as claimed in the literary sources, at which point Lavrion silver came to represent the bulk of the supply. This forces a reappraisal of the current paradigm since it seems that there was no abrupt and complete change of ore source to Lavrion, and therefore this cannot be connected with the introduction of the owl coin type. It also impacts our understanding of the very low gold content of Athenian owls compared with the earlier Wappenmünzen series, which should be attributed to the replacement of ore sources.

This study presents a comprehensive approach to provenancing ancient silver artefacts, introducing a novel algorithm to correct for mass‐dependent isotope fractionation. Applied to a Pb isotope database of 281 Hacksilber samples from southern Levantine hoards (1700–600 BCE) and compared with approximately 7000 galena ores from Spain to Iran, the analysis reveals shifting silver sources over time. Trade of the Levantine merchants with the pre‐ and early‐Celtic societies of the western Mediterranean appears to have followed long‐established east‐west corridors along the northern Mediterranean coast‐routes originally opened during the Neolithic expansion of Anatolian farmers and later reused during the Bronze Age and the Iron Age. The reduction in silver remelting reflects more efficient sourcing and trading practices by the end of the Iron Age.

Was silver coinage minted from fresh metal newly extracted from the mine or was it from recycled silver deriving from older coins, silverware, or cult objects? The answer helps understand the provenance of coins and their circulation. Using Pb isotopes, the present work proposes a method to disentangle the sources of 368 silver-alloy coins from Athens, Corinth, Aegina, Thasos, Thrace, Macedonia, and Ptolemaic Egypt. We outline a new mixing model based on Principal Component Analysis and allowing for multiple steps of bullion recycling. The first component accounts for 94–99% (typically 97–99%) of the total variance, which indicates that the data form a well-defined alignment indicative of a nearly binary mixture between two source ores referred to as ‘end-members’. Isotopic evidence establishes the subordinate but pervasive practice of remelting. The strong skewness of the first principal component distribution shows that lead is dominated by the binary mixing of end-members. The geologically young end-member has high 206Pb/204Pb and is best exemplified by Laurion ore used in Athenian coinage. With the possible exception of Ptolemaic samples, the second end-member attests to the persistence of a low-206Pb/204Pb, geologically much older, end-member. In most cases, the distributions of a further two principal components are nearly symmetric and can be considered normal. If they represent ore sources, their very small contribution to the total variance qualifies them as ‘noise’ (caused by random isotopic fluctuations in the ores and analytical issues). We find that the Pb isotope ratios in the coinage issued by each minting authority are distributed as a power law. The slope of this distribution varies from one mint to another, with the steepest slopes (Corinth and Ptolemaic Egypt) indicating the predominance of freshly mined silver. The shallow slope of Macedonia demands a larger proportion of geologically old Pb. Silver supplied to the mint of Athens shifted from a mixture of high- and low-206Pb/204Pb in the late 6th c. BCE to a predominance of unmixed high-206Pb/204Pb ore from the mines of Laurion thereafter and fell back to a mixture with intermediate Pb isotope compositions in the second half of the 4th c. BCE. The limitation of the present study resides in the relatively small number of Pb isotope data for each mint, which, in most cases, prevents a statistically significant analysis of these data by periods. Nevertheless, the quasi-binary nature of most silver mixes stands out as a new and strong first-order, albeit somewhat counterintuitive, inference from the present data.

Local types of coinage testify to the emerging use of silver in the Balkan interior, possibly related to abundant ore deposits in the region. Here, we present Pb isotope data for silver coins minted by local tribes and settlements (anepigraphic coins attributed to the Derrones/Laeaei, Damastion, Pelagia, Kings of Paeonia) between the 5th and 3rd centuries BCE. For comparison, we analysed coinage of the potential Greek emporia Dyrrhachium and Apollonia for their main element and Pb-Ag isotope compositions. Statistical data evaluation demonstrates close material connections between coins from the Balkan interior and identify a predominantly local raw material provenance. The majority of Damastion’s issues defines a tight cluster fitting Strabo’s (VII.7.8) account that the settlement possessed nearby silver mines in the Balkan interior. Novobërdë/Novo Brdo (Kosovo) can be plausibly hypothesised among the available reference data to have been one of the main ore districts supplying the mint. Mixing is evident for coins from the Kings of Paeonia and coinage attributed to the Derrones/Laeaei. Virtually identical end-members suggest that Paeonian regal coinage recycled tribal issues with contribution of metal obtained from Damastion’s hypothesised mines. Contemporaneous coinage struck by Dyrrhachium as well as end-members calculated for Thasos and the Macedon kingdom (Albarede et al. in Bullion mixtures in silver coinage from ancient Greece and Egypt, J Archaeol Sci 162:105918, 2024a) signal metal sourced from the Balkans, presumably the Macedonian/Paeonian border area. Comparison of data from Greek city-states and coinage issued by Apollonia and Dyrrhachium for the Romans demonstrates a change in the type and origin of raw materials and bullion composition, indicating a shift in monetary customs and possibly metal production technology.

A new algorithm is proposed that uses Pb isotopes to help identify the ore deposits utilized as sources of silver in Antiquity. The algorithm takes natural and analytical isotope fractionation into account. It proposes a statistical measure of the distances between the Pb isotope compositions of ores and artifacts. This measure is amenable to statistical tests at any confidence level. The new algorithm is applied to the Pb isotope compositions of the end-members derived from 368 new Pb isotope data on silver coinage minted between the late 6th to late 2nd centuries BCE and presented in Albarede et al. (2024). The algorithm identifies the local sources expected for the mints associated with major silver ores found in the territories of Athens, Thasos, and Thrace, while demonstrating that Thrace, Northern Macedonia, and Chalkidiki supplied notable amounts of bullion to Aegina and Ptolemaic Egypt. Minor proportions of what we are designating an old Sardinian ‘mix' created by long-distance trade was used by archaic Athens, Corinthia (Corinth and surrounding city-states), and Aegina. Various islands in the Cyclades (Siphnos, Keos, Seriphos) also appear to be early contributors to archaic Corinthian and Macedonian silver. The present study clearly demonstrates that recycled and mixed bullion formed a substantial part of the silver stocks of mints. The new algorithm warrants more detailed Pb isotopic studies of well-dated coinage to document the changing nature of silver fluxes over time.

Wood et al. (2023), hereinafter WPB, unveils a number of historical issues relevant to Roman economy and metallurgy based on trace element and Pb isotope abundance data on a large set of important coins minted during the Roman Empire (Ponting and Butcher 2015). Here, we discuss several points which, in our view, misrepresent the work of other groups, ours included, and bias the overall interpretation of the WPB data set.

The geochemical toolkit is pertinent to fields other than that of Earth and Planetary Sciences for which it is traditionally and commonly used. Here we show two recent examples of its application to numismatics, archaeology, and ancient history. High-precision Pb isotopes treated by novel statistical tools were used to provide data-based answers to important research questions revolving around the sources of silver used for money, jewelry, and other valuable artefacts in the ancient world. In the first example, we studied remnants of the silver making up the largest treasure of precious metals reported in ancient Western history, namely that of Alexander the Great which he looted in his conquest of the Persian Empire, by analyzing a large set of ancient silver coins (alexanders, sigloi, Greek coins, and early Indian pseudo-coinage) for their Pb isotopic compositions. The high-precision data were treated using a new statistical approach in the form of calculated Pb model ages combined with cluster analysis and convex-hull theory, which allows the tracking of silver provenance with greater accuracy and precision than was previously possible when using only raw Pb isotope ratios and manually comparing artefacts with known ores on a one-to-one basis. Based on the Pb isotopic compositions of the analyzed silver coins compared with a ca. 6700-entry Pb isotope database on ores that we have compiled from the literature and our own work, we established that the bulk of the silver sources can be traced to the southern Aegean, Macedonia, and Thrace [1]. These origins had so-far only been the subject of speculation by numismatists, archaeologists, and historians, whereas now they are supported by high-precision isotope data and objective data analysis. Furthermore, we were able to confidently exclude India as a source [1], thereby putting to rest a long-standing debate around a possible Indian silver contribution to the Persian treasury. In the second example [2], we measured high-precision Pb isotopes on pieces of hoarded Hacksilber (irregularly cut silver bullion) in the southern Levant, which facilitated trade and transactions from the beginning of the second millennium BCE until the late fourth century BCE. In a similar fashion to the first example, we treated the data using cluster analysis and convex-hull theory applied to Pb model ages calculated from measured high-precision Pb isotopic compositions. We found that exchanges between the Levant and the Aegean world continued at least intermittently from the Late Bronze Age through to the Iron Age III. Importantly, contrary to common belief that silver trade had come to an end following the Late Bronze Age collapse, we demonstrated that despite the Aegean world dominating silver supply during the Iron Age, exchanges between the eastern and the western Mediterranean did not cease altogether. People around the Mediterranean remained connected with silver flowing to the Levant possibly as a result of trade or plunder. [1] Blichert-Toft, J., de Callatay, F., Télouk, P., Albarède, F., submitted. J. Archaeo. Meth. Theo. [2] Gentelli, L., Blichert-Toft, J., Davis, G., Gitler, H., Albarède, F., 2021. J. Archaeo. Sci. 134, Article 105472.

Hacksilber facilitated trade and transactions from the beginning of the second millennium BCE until the late fourth century BCE in the southern Levant. Here we demonstrate the use of new, data-driven statistical approaches to interpret high-precision Pb isotope analysis of silver found in archaeological contexts for provenance determination. We sampled 45 pieces of Hacksilber from five hoards (Megiddo Area H, Eshtemoa, Tel Dor, `En Gedi, and Tel Miqne-Ekron) and combined our data with recent literature data for the same hoards plus five more (Beth Shean, Ashkelon, Tell Keisan, Tel `Akko, and `En Hofez) thus covering silver from the Late Bronze Age III (c.1200 BCE) to the end of the Iron Age IIC (586 BCE). Samples were taken by applying a new minimally destructive sampling technique. Lead was extracted using anion-exchange chromatography, and Pb isotopic compositions were measured by MC-ICP-MS. Data were treated using a new clustering method to identify statistically distinct groups of data, and a convex hull was applied to identify and constrain ore sources consistent with the isotopic signature of each group. Samples were grouped by minimizing variance within isotopic clusters and maximizing variance between isotopic clusters. We found that exchanges between the Levant and the Aegean world continued at least intermittently from the Late Bronze Age through to the Iron Age III, demonstrated by the prevalence of Lavrion (Attica), Macedonia, Thrace (northern Greece), southern Gaul (southern France), and Sardinia as long-lived major silver sources. Occasional exchanges with other west Mediterranean localities found in the isotopic record demonstrate that even though the Aegean world dominated silver supply during the Iron Age, exchanges between the eastern and the western Mediterranean did not altogether cease. The mixture of silver sources within hoards and relatively low purity of silver intentionally mixed with copper and arsenic suggest long-term hoarding and irregular, limited supply during the Iron Age I.

This paper details the application of a statistical method for the chronological discrimination of silver coins using counts per second trace elemental, inter-elemental ratios. The statistical method described is based on a method that has been applied to similar archaeological materials to determine their provenance. The method makes use of the inter-element association patterns of multi-element analytical data determined using laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). The majority of the 266 coins analysed for this study have already been successfully identified by their mint markings. The data from LA-ICP-MS analyses, together with what is known about the coins through visual identification, were used to discriminate the reigning sovereign, and in the case of Mexico, the year of minting, of individual coins within the elemental fingerprint of different mints. Subsequently, unidentified coins can be placed in the confusion matrix, and their trace element information used to identify their year of minting when compared with other, identified coins from the same mint. The interpretational statistical technique linear discriminant analysis (LDA) was used to explore an identification of year of minting of coins that have previously not been identified by other means based on a statistical comparison against a database of compositional analysis of silver coins of known year of minting.

The reasons why the Western Mediterranean, especially Carthage and Rome, resisted monetization relative to the Eastern Mediterranean are still unclear. We address this question by combining lead (Pb) and silver (Ag) isotope abundances in silver coinage from the Aegean, Magna Graecia, Carthage and Roman Republic. The clear relationships observed between 109Ag/107Ag and 208Pb/206Pb reflect the mixing of silver ores or silver objects with Pb metal used for cupellation. The combined analysis of Ag and Pb isotopes reveals important information about the technology of smelting. The Greek world extracted Ag and Pb from associated ores, whereas, on the Iberian Peninsula, Carthaginians and Republican‐era Romans applied Phoenician cupellation techniques and added exotic Pb to Pb‐poor Ag ores. Massive Ag recupellation is observed in Rome during the Second Punic War. After defeating the Carthaginians and the Macedonians in the late second century bce, the Romans brought together the efficient, millennium‐old techniques of silver extraction of the Phoenicians, who considered this metal a simple commodity, with the monetization of the economy introduced by the Greeks.

The conventional approach to ore provenance studies of ancient silver coins and artifacts has been to first analyze and then try to match them to published data about mining districts, a difficult task given our incomplete knowledge of these. While literary sources are useful to identify possible provenances, they potentially bias interpretations proper because of a variety of limitations of their time. Archeological evidence in the form of mining shafts, galleries, spoil heaps, and tools also provides a tangible and reliable record of mining, but dating such activity can be problematic and the record is inconsistent. Here we propose a new approach driven by Pb isotopic data rather than numismatic groups. Statistical analysis of Pb isotopic data is used to identify ore-defined isotopic clusters. This new method is based on an algorithm that predicts the number of isotopic clusters necessary to fulfill the simple condition that variance within isotopic clusters is minimized whereas inter-cluster variance is maximized. Since each cluster reflects a discrete geological episode within a particular environment broadly datable to a specific Pb model age, it can be identified as a potential source exploited by ancient miners. We explore the potential of this method in two examples using data from coins and ores respectively. In the first example, Roman Republican silver coins form three 'end-member' clusters sourced in mining districts with Cenozoic, Mesozoic, and Paleozoic Pb model ages. The example demonstrates how sources of silver used to mint coinage of the Roman Republic shifted within 50 years of the end of the Second Punic War in 201 BCE. In the second example using Aegean galena samples, Pb isotopes distinguish components with model ages datable to the Hercynian basement, the recent Aegean tectonic province, and Cyprus, noting that significant silver mining districts may remain unidentified in either Spain or the Aegean world. We further clarify a number of potential analytical issues and advocate that users of Pb isotopes for tracing archeological artifacts measure all four lead isotopes and inspect the 12 proposed isotope combinations in order to select those that provide the best representation of the data. We also emphasize that full advantage should be taken of the geologically informed parameters (model age and Th/U/Pb relationships) to identify the geological context of metal sources.

This research uses legacy data from shipwrecks to further our understanding of global silver movement in the 17th to 19th centuries by analysing a collection of silver coins held by the Western Australian Museum. Three hundred and eighty‐nine silver coins were analysed for their trace element fingerprint in order to identify provenance. The coins are a selection from the ships Batavia, Vergulde Draeck, Zuytdorp, Rapid and Correio da Azia, all wrecked off the coast of Western Australia between 1629 and 1816. Analysis was undertaken using laser ablation – inductively coupled plasma – mass spectrometry (LA–ICP–MS), a relatively non‐destructive technique with a sensitivity of parts per million to parts per billion. Data were interpreted using linear discriminant analysis (LDA), which allowed the coins of known provenance to be sorted into identifiable subgroups on the basis of their trace and minor elemental fingerprints, while 27 unidentified coins were compared with this database and their mint of origin predicted. These results have implications for the provenance determination of archaeological artefacts of many materials.

Archaeological evidence of ceramic production most commonly consists of locally procured raw materials. Excavations at Tell el-Timai in Lower Egypt recovered raw fine marl clay from two transport jars in the vicinity of pottery kilns dating to the 4th century b.c. Production wasters of small perfume bottles produced in the same fine marl clay were found inside the kilns. The marl clay inside the jars pointed to an origin outside of Lower Egypt. Samples of the clay and wasters, along with a confirmed locally sourced sample, were subjected to X-Ray Fluourescence (XRF) analysis, revealing significant differences in their chemical compositions. The results of the analysis are compared to published Egyptian data and an Upper Egyptian provenience is suggested because the raw clay is consistent with available comparative XRF data.

A circular structure was excavated in a suspected industrial area of ancient Thmuis (Tell Timai), and due to heavy vitrification and discolouration of the inside walls, was suspected to be a glass furnace. The excavated furnace provides a unique example to further understand the mechanisms of primary and secondary glass manufacture in Roman Egypt. Samples were subjected to a number of archaeometric investigations in order to characterise the furnace, and identify its purpose. Following attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy and scanning electron microscope energy dispersive spectroscopy (SEM-EDS), we conclude that the furnace was used for glass. We propose that it is most likely that the furnace represents a small-scale, secondary glassmaking centre, shaping glass manufactured at Wadi el-Natrun, and recycling glass objects from the local area.

Silver artefacts from the shipwreck Batavia, known to have been made on commission by the Dutch East India Company in 1627–1628 for trade in the Dutch East Indies, were analysed using LA-ICP-MS for trace elemental composition. The results were compared to a database of trace elemental compositions of Spanish, Spanish American and other European silver coins of known provenance. At the time Spain, which controlled the vast majority of world silver, was at war with the United Netherlands, and was enforcing a trade embargo, severely limiting the supplies of precious metals accessible by the Dutch. Based on their trace elemental composition, the Batavia silver artefacts were found to have been most similar to silver known to have originated in Germany and silver that reached the Dutch indirectly from Spain. These results shed light on the movement of silver as a commodity throughout the world during a unique time in history.

Universities are increasingly emphasising and utilising close ties with industry and industry professionals to keep up with the changing role of universities in society, from centres of learning to centres training graduates to be job-ready. This study investigates the effect of the utilisation of guest lecturers, specifically practicing industry professionals, and the related impact of limited small group discussion and continuity between lectures on undergraduate student learning. Two hundred and seventeen students were surveyed, 38 prior to and 179 after the addition of five full-cohort tutorials to the unit curriculum. These tutorials were added to assess the impact of tutorials on students' perceptions of the unit for future implementation of small group tutorials. The survey investigated student perceptions of the benefits of a lecture/tutorial style unit and those of a seminar series style unit. It was found that students recognise the importance of both industry professionals as lecturers and small group discussion in tutorials, which are not always compatible. As a result, recommendations for a compromise between the two unit formats are given, in order to take advantage of the benefits of both styles of teaching for student learning. This study has implications for any subject with close ties to industry, where a seminar series from a diverse range of professionals may be seen as a more desirable way to introduce undergraduate students to the subject area.