Gold Bar Mine

Eureka County, Nevada, United States

GoldSilverAntimonyArsenicMercuryBarium-BariteManganese

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Description

Atlas Precious Metals, Inc.

Commodities

PrimaryGold, Silver

TertiaryAntimony, Arsenic, Mercury, Barium-Barite, Manganese

Commodity typeB

Deposit

Deposit typedisseminated

Model173: Sediment-hosted Au

Deposit sizeS

Ore controlA northwesterly-trending fault is the main feeder structure for mineralizing fluids. Wider, thicker, and higher grade portions of the orebody occur at intersections of this main feeder zone with northwest-striking high-angle normal faults. Thin-bedded silty limestones are a lithologic control of gold deposition.

Materials

Ore mineralsGold, Hematite, Limonite, Barite, Stibiconite, Jasper, Orpiment, Pyrite, Realgar

GangueCalcite, Quartz

Geology

Host rockLimestone,Siltstone,Mudstone · "McColley Canyon Formation, Bartine member", "Denay Formation"

Associated rockAsh-Flow Tuff,Rhyolite,Tuff

StructurePaleozoic thrusting and folding and Tertiary age high angle faulting have affected rocks in the mine area. Limestone beds are gently folded along ENE-trending fold axes, forming anticlines and synclines that plunge 10-40 degrees to the east. The dominant Tertiary fault sets strike northwest and north-south; other sets strike east-northeast and northeast., The Gold Bar deposits are located in a window of lower plate rocks below the Roberts Mountain Thrust and lying along the NW-trending Battle Mountain-Eureka Trend of mineral deposits.

AlterationMineralization at Gold Bar is closely associated with major decalcification and to a lesser extent with silicification of host rocks and jasperoid development along high-angle structures. Also evident is remobilization of carbon and oxidation and redistribution. Minor bleaching, calcite veining, argillization. All alteration types occur mainly up dip from the feeder structure. The oxidation of pyrite and subsequent remobilization of iron oxides have produced spectacular brick-red to dark yellow brown banding in the oxidized, decalcified limestone. In many areas the ore exhibits intense liesegang banding. Most of the calcite veining is characterized by 0.1-30 cm veins located up dip from the orebody. Argillization is rare. Illitic clays have been locally altered to montmorillonite and allophane.

Economic & production

Development statusProducer

Production years1986-1996

First production1986

Last production1996

Discovery year1983

Identification

Deposit ID10310542

MRDS IDM242943

Alternate namesGold Bar Horst property, Goldstone orebody, Gold Ridge orebody, Gold Pick orebody, Gold Canyon orebody, Cabin Creek orebody, White Knight?s Olum claims

RegionNA

Data scoreA

Coordinates39.75936, -116.44063

References

Broili, C., et al., 1988, Geology and Gold Mineralization of the Gold Bar Deposit, Eureka County, Nevada, in Schafer, R.W., et al., eds., Bulk Mineable Precious Metal Deposits of the Western United States, the Geological Society of Nevada, Reno, p. 57-72.Masinter, R.A., 1991, Zoning of Altered Wall Rock and Spatial Relations to Gold Ore, Gold Bar Mine, Nevada, in Raines, G.L., et al., eds. Geology and Ore Deposits of the Great Basin, the Geological Society of Nevada, Reno, p. 701-703.Unpublished draft report by Atlas Precious Metals, Inc., 1988, NBMG District File 106, Item 14.NBMG, 1988, The Nevada Mineral Industry-1987, NBMG Special Publication Mi-1987.NBMG, 1991, The Nevada Mineral Industry-1990, NBMG Special Publication Mi-1990.Tingley and Smith, 1983, A Mineral Inventory of the Shoshone-Eureka Resource Area, Battle Mountain District, Nevada: NBMG OFR 83-3.Tingley and Smith, 1983, Results of geochemical sampling within the Shoshone-Eureka Resource Area, Eureka, Lander, and Nye Counties, Nevada: NBMG OFR 83-4.Bonham, H.F., 1989, Bulk-Mineable Precious-Metal Deposits and Prospects in Nevada, NBMG Map 91.NBMG Mining District File 106, Numerous press clippings.Final Environmental Assessment - Proposed Gold Bar Expansion Project (NV64-EA9-74), Bureau of Land Management, November 29, 1989.Atlas Corporation, 1992, Annual Report for Fiscal Year ended June 30, 1992.Atlas Corporation, 1991, Annual Report For Fiscal Year ended June 30, 1991.Atlas Corporation, 1990, Annual Report Form 10-K for Fiscal Year ended June 30, 1990.Atlas Corporation, 1989, Annual Report for Fiscal Year Ended June 30, 1989.Atlas Corporation, 1988, Annual Report for Fiscal Year ended June 30, 1988.Atlas Corporation, 1987, Annual Report for Fiscal Year ended June 30, 1987.Atlas Corporation, 1986, Annual Report for Fiscal Year ended June 30, 1986.Atlas Corporation, 1985, Annual Report for Fiscal Year ended June 30, 1985.NBMG, 1994, MI-1993Nevada Division of Minerals, 1994.Geology and Mineralization of the Gold Bar District, Southern Roberts Mountains, Eureka County, Nevada, 1998, French, G.M., Fenne, F.K., Maus, D.A., Rennebaum, T.D., and Jennings, T.A., in Sediment-hosted Gold Deposits of the Eureka (Ruby Hill Mine) and Gold Bar Districts, East-Central Nevada, Geological Society of Nevada Special Publication No., 27, 1998 Spring Field Trip Guidebook.NBMG MI-97.Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Significant deposits of gold, silver, copper, lead, and zinc in the United States: U.S. Geological Survey Open-File Report 90-206A, 33 p.; 98-206B. one 3.5 inch diskette.American Bonanza Gold Corp.Press Release: December 1, 2005http://www.whiteknightres.com/s/GoldBarHorst.asp