Mineral Deposits of the Bullard Mineral District, Harcuvar Mountains, Yavapai County, Arizona
Issue Date
1992Keywords
Arizona Geological Survey Open File ReportsArizona
Yavapai County
Harcuvar Mountains
Bullard Mineral District
bedrock geology
surficial geology
map
Geology
mineral depositsOligoceneMiocene'ProterozoicMid-Tertiarysilver oregold orecopper oremafic volcanicsmetamorphic rocksmylonitesmetamorphic core complexBasin and Range extensiondetachment faultmineral resources
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Spencer, J.E. and Reynolds, S.J., 1992, Mineral Deposits of the Bullard Mineral District, Harcuvar Mountains, Yavapai County, Arizona. Arizona Geological Survey Open File Report, OFR-92-01, 19 p.Description
The Bullard mineral district is one of approximately 15 mineral districts in west-central Arizona and southeastern California that are related to large-displacement, regionally low-angle normal faults known as detachment faults (Spencer and Welty, 1986; Roddy and others, 1988). Detachment faulting occurred during regional mid-Tertiary extension in the Basin and Range province and was associated with formation of extensional basins and elevated geothermal gradients (Spencer and Reynolds, 1989a). Mineral deposits related to detachment faults formed within this tectonic setting and were the result of hydrothermal ascent of basin brines along detachment faults (Wilkins and others, 1986). One of these districts includes the Copperstone mine, which has yielded several hundred thousand ounces of gold (Spencer and others, 1988). This article briefly describes the mineral deposits of the Bullard district and summarizes gold-assay data from numerous surface samples and from two drilling programs. Geologic similarities between the Bullard district and Copperstone deposit suggest that significant gold deposits could be present in the subsurface in the Bullard district.Additional Links
https://library.azgs.arizona.edu/Language
enSeries/Report no.
OFR-92-01Rights
Arizona Geological Survey. All rights reserved.Collection Information
Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.North Bounding Coordinate
34.2008South Bounding Coordinate
33.7636West Bounding Coordinate
-113.873East Bounding Coordinate
-113.137Collections
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