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The Yellowstone and Regal talc mines and their geologic setting in southwestern Montana

By
Sandra J. Underwood
Sandra J. Underwood
Childs Geoscience, Inc., 1700 West Koch St., Suite 6, Bozeman, Montana 59715, USA
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John F. Childs
John F. Childs
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Chad P. Walby
Chad P. Walby
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Helen B. Lynn
Helen B. Lynn
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Zachary S. Wall
Zachary S. Wall
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Michael T. Cerino
Michael T. Cerino
Barretts Minerals Inc., 8625 Hwy 91 South, Dillon, Montana 59725, USA
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Ericka Bartlett
Ericka Bartlett
Imerys Talc, Yellowstone Mine, 280 Johnny Ridge Road, Cameron, Montana 59720, USA
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Published:
January 01, 2014

Abstract

We summarize the geologic settings, generalized geology, and inferred conditions of talc formation for two major deposits in southwestern Montana. Imerys Talc operates the Yellowstone Mine in the Gravelly Range. Barretts Minerals Inc., a subsidiary of Minerals Technologies Incorporated, mines talc from two large deposits—the Regal and the Treasure—in the southern Ruby Range. Talc mineralization in southwestern Montana is associated with hydrothermal alteration of Archean dolomitic marbles along faults in the southern margin of the middle Proterozoic Belt Seaway. Conditions of talc formation appear to have varied across the region and probably range from shallow hot spring systems to connate brine circulation pathways in Belt basin sediments. A road log description of the geology along a loop from Bozeman to Dillon, Montana, to visit both the Yellowstone and Regal talc mines accompanies this paper.

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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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