Mount Hamilton Mine

White Pine County, Nevada, United States

MolybdenumTungstenSilverGoldCopperLeadZincTelluriumBismuthArsenicAntimony

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Commodities

PrimaryMolybdenum, Tungsten, Silver, Gold, Copper

SecondaryLead, Zinc

TertiaryTellurium, Bismuth, Arsenic, Antimony

Commodity typeM

Deposit

Deposit typePoly-metallic skarn

Model72: Polymetallic replacement

Deposit sizeS

Orebody formirregular

Ore controlOre is structurally controlled by the NW- and NE-trending faults and by the Hoppe Springs anticlinal axis, as well as by retrograde alteration zones, host rock lithology control, and proximity to the intrusive stock.

Materials

Ore mineralsScheelite, Molybdenite, Chalcopyrite, Gold, Pyrite, Arsenopyrite

GangueQuartz, Garnet, Pyroxene, Tremolite

Geology

Host rockLimestone,Shale · "Secret Canyon Shale", "Dunderberg Shale"

Associated rockGranodiorite · Seligman Stock

StructureRocks in the mine area have been affected by the NNW-trending Hoppe Springs Anticline, and later by steep normal faults with N-S, NE, and NW orientations.

AlterationAn extensive alteration aureole (five kilometers by two kilometers) formed in the Cambrian Secret Canyon and Dunderberg Shale Formations surropunding the Cretaceous granodirite stock. Alteration consistes of an early biotite hornfels replaced in part by a diopside-orthoclase hornfels. Skarn alteration is zoned from a garnet-dominated assemblage adjacent to the stock to a garnet-pyroxene skarn to a calcite-diopside-quartz-kspar-tremolite skarn, to distal biotite hornfels. Retrograde alteration consists of quartz-calcite-iron oxide assemblage afterg arnet and a subordinate quartz-calcite-epidote-iron oxide-amphibole-chlorite assemblage after garnet-pyroxene.

Economic & production

Development statusProducer

Identification

Deposit ID10310557

Alternate namesCentennial Mine, Northeast Seligman Mine, Treasure Hill Mine

RegionNA

Data scoreB

Coordinates39.2498, -115.55688

References

NBMG MI-96MI-97Map 91NBMG Bull 57, 1960Myers, G., Dennis, M. D., Wilkinson, W. H., and Wendt, C. J., 1991, Precious Metal Distribution in the Mount Hamilton Polymetallic Skarn System, Nevada: in Raines, G.L., Lisle, R.E., Schafer, R.W. and Wilkinson, W.H., Eds., Symposium Proceedings, Geology and Ore Deposits of the Great Basin, Geologic Society of Nevada and the U.S. Geological Survey, April 1-5, 1990, p. 677-685.Myers, G., Dennis, M. D., Wilkinson, W. H., and Wendt, C. J., 1991, Precious Metal Distribution in the Mount Hamilton Polymetallic Skarn System, Nevada:reprinted in Geology and Gold Deposits of Eastern Nevada; Bald Mountain Mine, Alligator Ridge, Robinson Project, Mount Hamilton Mine, Jones, A. Elizabeth, Ed., Special Publication - Geological Society of Nevada, Report: 23Long, 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.