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Title: Evaluation of the mining potential of the São Domingos mine wastes, Iberian Pyrite Belt, Portugal
Authors: Vieira, Alexandre
Matos, João
Lopes, Luís
Martins, Ruben
Editors: Geológicas, Comunicações
Keywords: São Domingos mine
mining wastes resources
Iberian Pyrite Belt
Issue Date: 3-Dec-2020
Publisher: LNEG, – Laboratório Nacional de Energia e Geologia IP
Citation: Vieira, A.; Matos, J.; Lopes, L., Martins, R. 2020. Evaluation of the mining potential of the São Domingos mine wastes, Iberian Pyrite Belt, Portugal. Comunicações Geológicas (2020) 107, III, 91-100 ISSN: 0873-948X; e-ISSN: 1647-581X.
Abstract: Abstract: The outcropping São Domingos Iberian Pyrite Belt deposit was mined since Roman time and between 1857 and 1966. The mine is formed by a 120 m depth flooded open pit and galleries until 420 m depth. Associated with felsic volcanic rocks and black shales of the Volcano-Sedimentary Complex, the deposit is formed by massive sulphide and stockwork ore (py, ccp, sp, ga, tt, apy) and related supergene enrichment ore (hematite gossan and covellite/chalcocite). Different mine wastes classes were mapped: gossan, felsic volcanic and shales, shales and landfill. Considering the CONASA mining waste characterization (162 shafts and 160 reverse circulation boreholes/LNEG database), new inferred resources are presented, using block modelling software: 2.38 Mt @ 0.77 g/t Au and 8.26 g/t Ag in non-conditioned volumes. Considering all evaluated wastes, including urban areas, an inferred resource of 4.0 Mt @ 0.64 g/t Au and 7.30 g/t Ag is presented, corresponding to a metal content of 82,878 oz t Au and 955,753 oz t Ag. Keywords: São Domingos mine, mining wastes resources, Iberian Pyrite Belt.
Type: article
Appears in Collections:GEO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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