Authors: John L. Muntean, Tyler J. Hill, Randall L. Hannink, Moira Smith, Ken Raabe, and Peter Shabestari
Series: Open-File Report 15-9
Format: plate: 33 x 32 inches, color, includes 1 cross section; text: 3 pages, b/w
This detailed geologic mapping of the southern Kinsley Mountains in eastern Nevada investigates the time-space relationships between an Eocene intrusive complex centered on a granitic stock, proximal intrusion-related polymetallic skarn and carbonate replacement mineralization, disseminated Carlin-style gold deposits 3 km north of the stock, faulting, and Eocene magmatism. Pilot Gold is currently exploring for more Carlin-style mineralization in the center of the range, just north of the completed map.
The mapping revealed the following:
1) A significant amount of extensional faulting occurred prior to Eocene magmatism and mineralization, similar to what NBMG mapping documented recently in the Eureka district. Eocene intrusions cut faults or fill faults.
2) Eocene dikes, gossans, and quartz veins, and jasperoid formation were focused within a 1-km-wide corridor that extends 3 km northward from the stock to the area of gold deposits, where dikes in drill core have locally high gold grades.
3) Significant Eocene extension is demonstrated by a southeast-dipping fault that dropped Permian rocks against metamorphosed and mineralized Cambrian rocks proximal to the Eocene stock. The fault is overlapped by Eocene volcanic rocks that are a few million years younger than the stock, suggesting the intrusive complex was rapidly exhumed nearly 3 km. Mapping of the southern end of the range is the first half of a project to meld the mapping with Pilot Gold’s mapping of the northern half of the range to complete a map of the entire Kinsley Mountains.
This map was prepared as a part of the STATEMAP component of the National Cooperative Geologic Mapping Program in cooperation with the U.S. Geological Survey.
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