Tertiary Epithermal To Mesothermal Porphyry-Related Au-Ag Mineralization In The Homestake Mine, Lead, South Dakota: Mineral And Metal Zoning
Uzunlar Nuri, Colin J. Paterson, Alvis L. Lisenbee, 1990. "Tertiary Epithermal To Mesothermal Porphyry-Related Au-Ag Mineralization In The Homestake Mine, Lead, South Dakota: Mineral And Metal Zoning", Metallogeny of Gold in the Black Hills, South Dakota, Colin J. Paterson, Alvis L. Lisenbee, Tommy B. Thompson
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The Homestake mine at Lead has produced gold since 1876 from a Precambrian iron-formation-hosted Au deposit (Bachman and Caddey, 1990, this volume). However, a distinct and separate epithermal to mesothermal Au- Ag-sulfide vein mineralization occurs in the mine and is spatially associated with a Tertiary rhyolitic dike complex. The mineral and metal associations, vein textures, and the crosscutting relationship with Tertiary rhyolite dikes distinguish these Tertiary veins from the Precambrian quartz veins and iron-formation-hosted gold deposits. Underground exposures to a depth of 3 km (9000 feet) allow documentation of vertical and lateral zoning of the Tertiary mineralization.
The purpose of this paper is to report mineralogic assemblages of the Tertiary epithermal-mesothermal veins, mineral and metal zoning, and timing of the veins based on crosscutting relationship and mineral assemblages.