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dc.contributor.authorSpencer, J.E.
dc.contributor.authorReynolds, S.J.
dc.date.accessioned2018-09-29T02:15:00Z
dc.date.available2018-09-29T02:15:00Z
dc.date.issued1992
dc.identifier.citationSpencer, 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.
dc.identifier.urihttp://hdl.handle.net/10150/629839
dc.descriptionThe 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.
dc.language.isoen
dc.relation.ispartofseriesOFR-92-01
dc.relation.urlhttps://library.azgs.arizona.edu/
dc.rightsArizona Geological Survey. All rights reserved.
dc.subjectArizona Geological Survey Open File Reports
dc.subjectArizona
dc.subjectYavapai County
dc.subjectHarcuvar Mountains
dc.subjectBullard Mineral District
dc.subjectbedrock geology
dc.subjectsurficial geology
dc.subjectmap
dc.subjectGeology
dc.subjectmineral deposits
dc.subjectOligocene
dc.subjectMiocene'
dc.subjectProterozoic
dc.subjectMid-Tertiary
dc.subjectsilver ore
dc.subjectgold ore
dc.subjectcopper ore
dc.subjectmafic volcanics
dc.subjectmetamorphic rocks
dc.subjectmylonites
dc.subjectmetamorphic core complex
dc.subjectBasin and Range extension
dc.subjectdetachment fault
dc.subjectmineral resources
dc.titleMineral Deposits of the Bullard Mineral District, Harcuvar Mountains, Yavapai County, Arizona
csdgm.bounding.west-113.873
csdgm.bounding.east-113.137
csdgm.bounding.north34.2008
csdgm.bounding.south33.7636
dc.description.collectioninformationDocuments 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.
refterms.dateFOA2018-09-29T02:15:00Z


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