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Gold Occurrence in the Black Cloud 3 Orebody, Leadville Mining District, Lake County, Colorado

By
Matthew D. Gray
Matthew D. Gray
Department of Geosciences, The University of Arizona, Tucson, Arizona 85721
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Spencer R. Titley
Spencer R. Titley
Department of Geosciences, The University of Arizona, Tucson, Arizona 85721
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Published:
January 01, 1990

Abstract

Gold is an important constituent of many carbonate-hosted massive sulfide ores of the Colorado mineral belt. Within the Leadville district of the Colorado mineral belt gold has been recovered in substantial amounts from such ores. A detailed petrographic and electron mi-croprobe study of one such Leadville orebody, the Black Cloud 3, was undertaken in order to characterize the gold occurrence. Three styles of gold occurrence, including a complex Au-Ag-Bi-Te mineral assemblage, are documented. Gold occurs in the massive sulfide ore as native grains contained predominantly in pyrite, as electrum grains contained within cross-cutting sulfide veinlets, and as electrum and Au-Ag tellurides included in a bismuth-tellurium mineral assemblage also containing hessite (Ag2Te), tellurobismuthite (Bi2Tes), volynskite (AgBiTe2), chalcopyrite, galena, quartz, matildite (AgBiS2), and coloradoite (HgTe).

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Economic Geology Monograph Series

Carbonate-Hosted Sulfide Deposits of the Central Colorado Mineral Belt

David W. Beaty
David W. Beaty
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;
Gary P. Landis
Gary P. Landis
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Tommy B. Thompson
Tommy B. Thompson
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Society of Economic Geologists
Volume
7
ISBN electronic:
9781629490021
Publication date:
January 01, 1990

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