Hog Ranch Mine

Washoe County, Nevada, United States

GoldSilverMercuryUranium

⌖ Show on map USGS source ↗

Commodities

PrimaryGold, Silver

TertiaryMercury, Uranium

Commodity typeM

Deposit

Deposit typeHot spring epithermal

Model104: Hot-spring Au-Ag

Deposit sizeM

Orebody formdisseminated

Ore controlMineralization is strongly fracture controlled.

Materials

Ore mineralsGold

GanguePyrite, Stibnite, Realgar, Cinnabar, Sulfur, Alunite, Chalcedony, Quartz, Clay

Geology

Host rockTuff,Rhyolite,Pyroclastic Rock,Mixed Clastic/Volcanic Rock

Associated rockRhyolite · Canyon Rhyolite

StructureThe 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.

AlterationThere 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. \nHost rocks are affected by pervasive hydrothermal silicification, opalization, and kaolinization.

Economic & production

Development statusProducer

Production years1986-1995

First production1986

Last production1995

Identification

Deposit ID10310380

MRDS IDM232557

Alternate namesWestern Hog Ranch Mine, Krista Pit, East Deposit, West Deposit, Geib Pit, Bell Spring Deposit, Airport orebody, 139 orebody, White Mountain orebody, NBMG Sample Site 2410

RegionNA

Data scoreB

Coordinates41.15793, -119.4513

References

Harvey, D.S., Noble, D.C., McKee, E.H., 1986, Hog Ranch Property: in Isochron West, No 47.Drossulis, Kim, 1988, Geology of the Hog Ranch Mine, Washoe Co., NV: in GSN 1988 Spring Field Trip Guidebook.NBMG Mining District File 314: Numerous Press ClippingsNBMG Spec. Pub MI-1987-1995Bonham, H.F., 1986, NBMG Map 91Jones, R.B., 1984, NBMG Field ExaminationGarside, L.J., 1973, Radioactive Mineral Occurrences in Nevada: NBMG Bull 81.Staff, 1988, Directory of Nevada Mine Operations Active During Calendar Year 1987: Nevada Division of Mine Inspection, 84p.Western Mining Corp, 1990, Annual Report for Fiscal Year 1989-1990.Wwestern Mining Corp, 1991, Annual Report For Fiscal Year 1990-1991.Nevada Division of Minerals, 1994Long, 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.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 CordilleraDrossulis, Kim, 1988, Geology of the Hog Ranch Mine, Washoe County, Nevada; Geological Society of Nevada, Special Publication - vol.7, pp.67-77.Romarco Minerals press release, May 2004.