Abstract
This paper presents a comprehensive study of the evidence for ancient tin mining at the Ervedosa mine (Vinhais, Portugal). The geological context of the site indicates a rich cassiterite (SnO2) deposit, which was subject to mining in the twentieth century. Some ancient mining and ore processing stone tools were recovered during the twentieth century mining operations, namely one hammer, one pounder, one flat anvil and five small tools used both as pounders and crushing anvils, evidencing prehistoric mining activities. XRF and SEM–EDS chemical analyses were performed on primary and secondary cassiterite samples from the mining site, demonstrating the abundance and chemical heterogeneity of the tin (Sn) ores. The stone tools can be ascribed to Bronze Age or, at the latest, Early Iron Age (2nd millennium to the first half of 1st millennium BCE) by comparison with similar tools from other Iberian and European archaeological contexts. High-resolution photogrammetric 3D models of the tools are made available in this study. The historical descriptions of the findings and the research made on the technical archives about the mine allowed correlating the tools to mining in a primary context, focused on rich quartz veins in granitic or greisen bedrock, rather than mining in a secondary context. XRF and SEM–EDS analyses performed on the stone material and on surface adherences support their identification as specific types of hard rocks, such as granite, amphibolite and quartzite, and allowed the detection of Sn-rich adherent particles, confirming their use for Sn-material processing. The potential relation between the cassiterite resources and the local later prehistoric (Bronze Age to Early Iron Age) settlement pattern is also discussed. The results raise awareness and provide relevant data about the existence of tin mining in primary contexts during later prehistoric times in the NW Iberian Peninsula.
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Acknowledgements
We want to thank the Museu de Jazigos Minerais Portugueses in São Mamede de Infesta (Portugal) and the Geosciences Museum of the Instituto Superior Técnico in Lisbon (Portugal) for giving us access to their collections and allowing the photogrammetric work. We are grateful to Paulo Pita and Ana Bela Amorim, from the Arquivo Histórico do Norte do Portugal of the Direção Geral de Energia e Geologia – Divisão das Pedreiras do Norte (Portugal), for the communication of technical documents about the Ervedosa tin mine. We want to acknowledge the Museu Arqueológico Municipal José Monteiro (Fundão, Portugal) for the access to their collection and for authorization of using the picture of the stone hammer nº MAMJM167. We acknowledge the anonymous reviewers for their comments, helpful to improve the manuscript.
Funding
This research was funded by FEDER through the COMPETE 2020 Programme, Lisboa Regional Programme and European Regional Development Fund (FEEI), and National Funds through FCT (Fundação para a Ciência e Tecnologia) under the scope of the Iberian Tin project (PTDC/HARARQ/32290/2017) and Gold.PT project (2022.02608.PTDC). Part of this work was also funded by National Funds through the FCT under the scope of the projects UIDB/50025/2020–2023 to CENIMAT/i3N, UIDB/04449/2020 to HERCULES Laboratory and UIDB/04666/2020 to CHAM.
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E.M., F.D., J.F., A.R., E.F. and C.B. wrote the main manuscript text. Figures 1, 4, 5 and 11 were prepared by E.M.; Fig. 2 by J.F and E.M.; Fig. 3 by E.M. and A.R.; Figs. 6, 7 and 8 by F.D. and E.M.; Figs. 9 and 10 by A.R. and E.F. Online resources 1 and 9 were prepared by A.R. and E.M., Online resources 2–8 by C.B. and E.M. Field work was performed by A.L., F.D., E.F., J.F. and E.M. Sample selection was done by M.F.C.P., E.F. and A.L. Chemical analyses and their interpretation were in charge of A.R., E.F., R.J.C.S., J.P.V., F.D. and A.L. Photogrammetry of the tools was performed by C.B. Archive documentation was processed by E.M., J.F., F.D. and A.L. All authors reviewed the manuscript.
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12520_2023_1748_MOESM1_ESM.png
Supplementary file1 (PNG 1588 KB) Online resource 1: pXRF spectra of six cassiterite samples from Ervedosa (Museu de Jazigos Minerais Portugueses) analysed. Legend: * – Kα and Kβ lines of V, Cr and/or Mn overlap, uncertain presence of these elements; x – rhodium tube X-ray lines and other background peaks.
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Supplementary file9 (PNG 2393 KB) Online resource 9: pXRF spectra of six stone artefacts (ore processing tools) analysed from Ervedosa (Museu de Jazigos Minerais Portugueses).
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Meunier, E., Dias, F., Fonte, J. et al. Later prehistoric tin mining in the Ervedosa mine (Vinhais, Portugal): evidence and context. Archaeol Anthropol Sci 15, 43 (2023). https://doi.org/10.1007/s12520-023-01748-x
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DOI: https://doi.org/10.1007/s12520-023-01748-x