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Breccia Types in the Betze Orebody, Goldstrike Mine, Eureka County, Nevada

By
S.G. Peters
S.G. Peters
U.S. Geological Survey, Reno Field Office, Mackay School of Mines, MS-176, University of Nevada, Reno, NV 89557-0047
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R.W. Leonardson
R.W. Leonardson
Barrick Goldstrike Mines, Inc.PO Box 29, Elko, Nevada 89803
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G.C. Ferdock
G.C. Ferdock
Department of Geological Sciences, Ralph J. Roberts Center for Research in Economic Geology (CREG), Mackay School of MinesUniversity of Nevada-Reno, Reno, Nevada 89557.
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E.A. Lauha
E.A. Lauha
U.S. Geological Survey, Reno Field Office, Mackay School of Mines, MS-176, University of Nevada, Reno, NV 89557-0047
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Published:
January 01, 1997

Abstract

This paper describes outcrop- and hand specimen-scale breccias in the Betze orebody, which is the largest gold deposit on the Carlin trend (Bettles and Lauha, 1991; Leonardson and Rahn, 1996). The Betze orebody lies in the north-central part of the Carlin trend in the Goldstrike Mine (Fig. 1), and it is part of the Betze-Post deposits (Arehart et al., 1993; Lauha and Bettles, 1993; Smith and Sharon, 1994; Leonardson and Rahn, 1996). The orebody and much of the internal breccia bodies have a general WNW strike, with a sub-horizontal attitude (Peters, 1996; 1997). The open pit Goldstrike Mine exposes the Betze and Post orebodies, the Post anticline (Fig. 2), contacts between the Silurian and Devonian Roberts Mountains Formation, Devonian Popovich limestone and Devonian Rodeo Creek unit, and the northern contact of the Jurassic Goldstrike stock (Volk and Zimmerman (1991).

Breccia bodies host much of the Betze ore body. Breccias are common rock types in most Carlin-type deposits (Williams, 1992, 1993), and they are particularly common in ore bodies of the north-central Carlin trend (Clode, 1993; Griffin et al., 1993; Leach, 1993). The host rocks in the Betze orebody are altered and deformed. The complex descriptive geology of the Goldstrike Mine is detailed by Volk et al. (1996), Peters et al.(1996), and Leonardson and Rahn (1996). The WNW-striking Dillon deformation zone (DDZ) hosts the upper central Betze orebody (Fig. 2) and contains several ore types associated with breccia (Peters, 1996, 1997). Rock types that host the orebody include phyllonitic black to

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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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