Rosebud Gold Mine

Pershing County, Nevada, United States

GoldSilverAntimonySeleniumBarium-BariteCopperArsenicMercury

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Commodities

PrimaryGold, Silver

TertiaryAntimony, Selenium, Barium-Barite, Copper, Arsenic, Mercury

Commodity typeB

Deposit

Deposit typeHot springs Au-Ag; volcanic-hosted, low sulfidation, epithermal Au_Ag

Model150: Epithermal vein, Comstock

Deposit sizeS

Orebody formtabular

Ore controlThe South Ridge fault is the primary control of mineralization. In the main zone, gold and silver occur in stockwork veins hosted by altered and weakly mineralized volcanic rocks in the hanging wall of the South Ridge fault. In the East Zone, mineralization is localized along and within the footwall of the South Ridge fault.

Materials

Ore mineralsElectrum, Silver

GangueQuartz, Calcite, Pyrite, Marcasite, Stibnite, Barite, Limonite, Jarosite

Geology

Host rockQuartz Latite,Rhyolite,Pyroclastic Rock,Metasedimentary Rock · "Basal Wildrose unit of the Kamma Formation", "Auld Lang Syne group"

StructureThe structural setting in the Rosebud Deposit area is dominated by the northeast trending Cave fault and the east-west trending South Ridge fault. The Cave fault is a regional structure that strikes from N50?E to N60?E and dips between 25? to 30? to the northwest. Stratigraphic offset across the Cave fault displays up to 2,000 feet of apparent normal displacement.\n, The Rosebud shear zone strikes N60E and has 5000 ft.of left lateral displacement. The South Ridge fault strikes E-W and dips 25 to 45 to the north.

AlterationVolcanic rocks in the mine area have been bleached, clay-altered (argillized, illite formed), sericitized, and locally silicified.

Economic & production

Development statusProducer

Production years1908-1947; 1997-2000

First production1908

Last production2000

Discovery year1989

Identification

Deposit ID10310434

MRDS IDM242759

Alternate namesShort Shot target, White Alps target, Wildrose target, Dozer Hill Deposit, Dreamland South ore zone, Dreamland East ore zone, Dreamland North ore zone, NBMG sample sites 1798 and 1799, Portal No. 1, Portal No. 2, East Dreamland target, North Kamma target, Schoolbus Canyon target

RegionNA

Data scoreA

Coordinates40.80405, -118.64877

References

Kenner, K., 1992, Discovery and Geology of Gold Mineralization at the Rosebud Project, Pershing County, Nevada, oral presentation, the Geological Society of Nevada, Elko Chapter, December 16.Johnson, M., 1977, Geology and Mineral Deposits of Pershing County, Nevada, NBMG Bull 89, 115 pp.LAC Minerals Corp., 1991, Annual Report for 1990."Equinox Expects Decision by Spring for Rosebud Work", The Northern Miner, January 20, 1992, p.17.Engineering and Mining Journal, March, 1933."Rosebud Stepout Drilling Returns Erratic Values", The Northern Miner, December 14, 1992.Quade, Jack, 1984, NBMG Field Examination on September 2 and sample analyses.Bonham, Garside, Jones, Papke, Quade, Tingley, 1985, A Mineral Inventory of the Paradise-Denio and Sonoma-Gerlach Resource Areas, Winnemucca District, Nevada, NBMG Open File Report 85-3.Walck, C. M., Bennett, R. E., Kuhl, T. O., and Kenner, K. L., 1993, Discovery and Geology of Gold Mineralization at the Rosebud Project, Pershing County, Nevada: Society for Mining, Metallurgy, and Exploration, Inc., Preprint No. 93-175, 4 pp."Equinox to Buy Lac's Rosebud," The Northern Miner, May 17, 1993, p. 3.NBMG, 1994, MI-1993.Crafford, A.E.J. (ed.), 2003, GSN Road Log 2, Interstate 80 Eastbound, Fernley (Exit 48) to Golconda (Exit 194).