Mine detail: Hog Ranch Mine

Previously called 'Western Hog Ranch MineKrista PitEast DepositWest DepositGeib PitBell Spring DepositAirport orebody139 orebodyWhite Mountain orebodyNBMG Sample Site 2410'

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Location

Lat / long:

41.15793, -119.4513

Resource(M)

Primary:	Gold, Silver
Tertiary:	Mercury, Uranium
Ore:	Gold
Gangue:	Pyrite, Stibnite, Realgar, Cinnabar, Sulfur, Alunite, Chalcedony, Quartz, Clay
Orebody form:	disseminated

Production

Operation type:	Surface
Deposit type:	Hot spring epithermal
Production size:	Medium
Development status:	Producer
Production years:	1986-1995
First production started:	1986
Last production ended:	1995

Geology

Host type:	Tuff,Rhyolite,Pyroclastic Rock,Mixed Clastic/Volcanic Rock
Associated rock:	Canyon Rhyolite
Associated type:	Rhyolite
Structure:	The mineralization is possibly localized along a major ring-fracture system associated with the Cottonwood Creek Volcanic Center., The Hog Ranch property is located in the transitional zone between the Columbia Plateau physiographic province to the north, and the Basin and Range province to the south with a collapsed caldera or failed caldera system possibly present.
Alteration processes:	There are two disticnct alteration systems present: a large one associated with the north Hog ranch deposits and a smaller one around the Bell Springs deposit to the south. The northern system is dominated by clay mineralization zoning from near-surface kaolinite to illite at depth. Host rocks are affected by pervasive hydrothermal silicification, opalization, and kaolinization.

References

MRDS	M232557
DEP	10310380
Reference	{Deposit:: Harvey, D.S., Noble, D.C., McKee, E.H., 1986, Hog Ranch Property: in Isochron West, No 47.}{Deposit:: Drossulis, Kim, 1988, Geology of the Hog Ranch Mine, Washoe Co., NV: in GSN 1988 Spring Field Trip Guidebook.}{Deposit:: NBMG Mining District File 314: Numerous Press Clippings}{Deposit:: NBMG Spec. Pub MI-1987-1995}{Deposit:: Bonham, H.F., 1986, NBMG Map 91}{Deposit:: Jones, R.B., 1984, NBMG Field Examination}{Deposit:: Garside, L.J., 1973, Radioactive Mineral Occurrences in Nevada: NBMG Bull 81.}{Deposit:: Staff, 1988, Directory of Nevada Mine Operations Active During Calendar Year 1987: Nevada Division of Mine Inspection, 84p.}{Deposit:: Western Mining Corp, 1990, Annual Report for Fiscal Year 1989-1990.}{Deposit:: Wwestern Mining Corp, 1991, Annual Report For Fiscal Year 1990-1991.}{Deposit:: Nevada Division of Minerals, 1994}{Deposit:: Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Database of significant deposits of gold, silver, copper, lead, and zinc in the United States; Part A, Database description and analysis; part B, Digital database: U.S. Geological Survey Open-File Report 98-206, 33 p., one 3.5 inch diskette.}{Deposit:: Bussey, Steven D. , 1995, Gold mineralization and associated rhyolitic volcanism at the Hog Ranch Mine, Northwest Nevada:GSN symposium proceedings, Geology and ore deposits of the American Cordillera}{Deposit:: Drossulis, Kim, 1988, Geology of the Hog Ranch Mine, Washoe County, Nevada; Geological Society of Nevada, Special Publication - vol.7, pp.67-77.}{Deposit:: Romarco Minerals press release, May 2004.}
Reporter	Paidakovich, Matthew E., LaPointe, D. D. (Tingley, J.V.), Moyer Lorre A. (Marcus, S.), Phinisey, J. D. (Marcus, S.), Li, Zhiping ( Moyer, L.), Schruben, Paul G.