Geology and isotope geochemistry of the Beaver-Temiskaming Silver Mine, Cobalt, Ontario

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  • Silver veins at the Beaver-Temiskaming mine are economic in Archean mafic volcanic and intercalated base-metal sulphide-rich sedimentary rocks, but uneconomic in the Proterozoic Nipissing diabase sill. Textural and isotopic evidence indicate a paragenetic succession of silicates, arsenides-sulpharsenides, silver-sulphosalts-sulphides, and carbonates. Metal zoning in the As-bearing minerals is Ni-Co-Fe. Depositional temperatures were about 210-240°C (oxygen isotopes in silicates), 211-258°C (arsenopyrite composition) and 130-227°C (coexisting sulphides). Carbonate isotopic data were reset by meteoric water. Connate waters, interpreted from fluid inclusion data, equilibrated with Archean sulphide-rich interflow units and overlying Proterozoic detritus (Pb isotopic data) and then deposited these elements in veins after the diabase had cooled sufficiently to fracture.

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  • Copyright © 1985 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, research, scholarship, and teaching. Theses may only be shared by linking to Carleton University Institutional Repository and no part may be used without proper attribution to the author. No part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.
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  • 1985


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