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Book Chapter

Preliminary Facies Analysis of Devonian Autochthonous Rocks that Host Gold Along the Carlin Trend, Nevada

By
Augustus K. Armstrong
Augustus K. Armstrong
U.S. Geological SurveyMenlo Park, CA
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Ted G. Theodore
Ted G. Theodore
U.S. Geological SurveyMenlo Park, CA
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Boris B. Kotlyar
Boris B. Kotlyar
U.S. Geological SurveyMenlo Park, CA
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Eric G. Lauha
Eric G. Lauha
Barrick Goldstrike Mines, Inc.Elko, NV
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Gregory L. Griffin
Gregory L. Griffin
Barrick Goldstrike Mines, Inc.Elko, NV
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David L. Lorge
David L. Lorge
Trio Gold and Minorca Resources, Inc.Reno, NV
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Earl W. Abbott
Earl W. Abbott
Trio Gold and Minorca Resources, Inc.Reno, NV
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Published:
January 01, 1997

Abstract

Sedimentary platformal rocks in northern Nevada serve as hosts for the bulk of the gold introduced into Carlin-type gold deposits (Roberts, 1966; Arehart et al, 1993a; Christensen, 1996), and these deposits largely account for this region comprising the most significant gold province in North America. In 1997, approximately 7 MM oz Au will be produced from the province, which amounts to approximately 64 percent of United States and 9 percent of world production (Nevada Mining Association Newsletter, 1996, http://www.nevadamining.org/econ_overview_95.html). Production since 1965 from the Carlin trend of deposits, a 40-mile-long string of mineralized centers, totals approximately 21 MM oz Au (Christensen, 1996). The most prolific part of the Carlin trend is its northern half which extends from the Gold Quarry Mine on the south to the Dee Mine on the north (Fig. 1). Although sedimentary rocks constitute a fundamental element of the genetic model for Carlin-type deposits (Cox and Singer, 1986), the implications and impacts of Paleozoic sedimentary fabrics and diagenetic processes on the genesis of these deposits have not been investigated as thoroughly as have the types of associated alteration, chemistry of the mineralizing fluids, and structural setting(s) of the deposits. The purpose of this report is to present a facies analysis of those autochthonous Devonian rocks that are the principal hosts for gold in the northern part of the Carlin trend (Fig. 2), and to suggest that some essential attributes derived from the sedimentary environments of these rocks contributed significantly to their becoming the premier gold hosts that

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Contents

Society of Economic Geologists Guidebook Series

Carlin-Type Gold Deposits Field Conference

Peter Vikre
Peter Vikre
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Tommy B. Thompson
Tommy B. Thompson
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Keith Bettles
Keith Bettles
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Odin Christensen
Odin Christensen
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Ron Parratt
Ron Parratt
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Society of Economic Geologists
Volume
28
ISBN electronic:
9781934969816
Publication date:
January 01, 1997

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