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Regional setting and deposit geology of the Golden Sunlight Mine: An example of responsible resource extraction

By
Nancy Oyer
Nancy Oyer
Barrick Gold Corporation, 453 MT Hwy 2 E, Whitehall, Montana 59759, USA
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John Childs
John Childs
Childs Geoscience Inc., 1700 West Koch Street, Suite 6, Bozeman, Montana 59715, USA
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J. Brian Mahoney
J. Brian Mahoney
Department of Geology, University of Wisconsin, Eau Claire, Wisconsin 54702, USA
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Published:
January 01, 2014

Abstract

The Barrick Golden Sunlight Mine (GSM) in Whitehall, Montana, is an industry leader in safe, responsible resource extraction. With more than 3 million ounces of gold poured since 1983, and current proven and probable reserves of 318,000 ounces of gold, GSM is the largest gold producer in Montana. The gold-silver deposit is localized in a hydrothermal breccia pipe related to Late Cretaceous latite porphyry magmatism hosted by the Mesoproterozoic Belt Supergroup, and is influenced by younger cross-cutting faults and fracture systems. The deposit has been mined by both underground and open pit methods, and the current open pit operation was recently permitted for expansion. The mill and tailings operations practice efficient and environmentally responsible resource recovery by processing ore from historical tailings and dumps from around the state in addition to ore from the Golden Sunlight property. This trip will explore the complex geologic and tectonic controls on mineralization and review how GSM has addressed the technical challenges of mining, milling, and reclamation.

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Contents

GSA Field Guide

Exploring the Northern Rocky Mountains

Colin A. Shaw
Colin A. Shaw
Department of Earth Sciences Montana State University Bozeman, Montana 59717, USA
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Basil Tikoff
Basil Tikoff
Department of Geoscience University of Wisconsin 1215 W. Dayton Street Madison, Wisconsin 53706, USA
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Geological Society of America
Volume
37
ISBN electronic:
9780813756370
Publication date:
January 01, 2014

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