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Tertiary Epithermal To Mesothermal Porphyry-Related Au-Ag Mineralization In The Homestake Mine, Lead, South Dakota: Mineral And Metal Zoning

By
Uzunlar Nuri
Uzunlar Nuri
Department of Geology and Geological Engineering South Dakota School of Mines and Technology, Rapid City, South Dakota 57701
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Colin J. Paterson
Colin J. Paterson
Department of Geology and Geological Engineering South Dakota School of Mines and Technology, Rapid City, South Dakota 57701
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Alvis L. Lisenbee
Alvis L. Lisenbee
Department of Geology and Geological Engineering South Dakota School of Mines and Technology, Rapid City, South Dakota 57701
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Published:
January 01, 1990

Abstract

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.

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Contents

Society of Economic Geologists Guidebook Series

Metallogeny of Gold in the Black Hills, South Dakota

Colin J. Paterson
Colin J. Paterson
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Alvis L. Lisenbee
Alvis L. Lisenbee
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Tommy B. Thompson
Tommy B. Thompson
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Society of Economic Geologists
Volume
7
ISBN electronic:
9781934969601
Publication date:
January 01, 1990

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