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Showing 1 to 2 of 2 for “"supergene processes"”.
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The stratigraphic and structural controls on copper-gold mineralization at Cassenha hill prospect, within the Archean to Paleoproterozoic Angolan shield, Congo craton, South Western Angola
… ± chalcopyrite ± other copper sulfides, and supergene ore (stage II) consisting of malachite ± azurite ± chrysocolla, which represents the prevalent mineralization at the prospect. The δ 18O value of quartz veins range from +12.81 to +13.53‰, while the δD of chlorite minerals range from -51 …
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Geology, geochemistry, and genesis of the El Peñón epithermal Au-Ag deposit, northern Chile : characteristics of a bonanza-grade deposit and techniques for exploration
… 70-69 Ma and 50-49 Ma, respectively. Dating of supergene alunite indicates that weathering within a semi-arid to arid climate occurred from 23-17 Ma, prior to the onset of hyperaridity. The veins that comprise the El Peñón deposit range from <0.5 m to 22 m wide; the bonanza-grade Quebrada …