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Summary: Rocky Mountain (56th Annual) and Cordilleran (100th Annual) Joint Meeting (May 35, 2004)
Paper No. 7-4
Presentation Time: 9:20 AM-9:40 AM
WALLROCK ALTERATION ASSOCIATED WITH THE
CHUKAR FOOTWALL CARLIN-TYPE DEPOSIT,
EUREKA COUNTY, NEVADA
JOHNSTON, Marcus K., Generative Exploration, Newmont Mining Corporation, 337
West Commercial St, Elko, NV 89801, marcus@apexmineralresources.com and AREHART,
Greg B., Department of Geology, Univ of Nevada Reno, MS 172, Reno, NV 89557-0001
Carlin-type deposits (CTDs) are the dominant source of gold production and reserves in the
United States today. Many of these deposits occur along the Carlin trend in north-central
Nevada. Despite being studied for more than 40 years, many aspects of CTDs remain
enigmatic. One important aspect that is not clearly understood concerns the compositions,
zonations, and extents of wallrock alteration halos around the deposits.
This study presents the results from examination of the wallrock alteration halo associated
with the Chukar Footwall gold deposit, a CTD located in the central part of the Carlin trend.
With a gold endowment of approximately 530,000 oz, Chukar is a relatively small satellite
deposit to the much larger Gold Quarry deposit, which contains a total of 24 million oz in
past production and current reserves and resources.
For Chukar, descriptions of lithologies, geological structures, and hydrothermal alteration
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