Mine detail: Mount Hamilton Mine

Previously called 'Treasure Hill MineNortheast Seligman MineCentennial Mine'

<< Back to the map

Location

Lat / long:

39.2498, -115.55688

Resource(M)

Primary:	Molybdenum, Tungsten, Silver, Gold, Copper
Secondary:	Lead, Zinc
Tertiary:	Tellurium, Bismuth, Arsenic, Antimony
Ore:	Scheelite, Molybdenite, Chalcopyrite, Gold, Pyrite, Arsenopyrite
Gangue:	Quartz, Garnet, Pyroxene, Tremolite
Orebody form:	irregular

Production

Operation type:	Surface
Deposit type:	Poly-metallic skarn
Production size:	Small
Development status:	Producer

Geology

Host rock:	Secret Canyon Shale, Dunderberg Shale
Host type:	Limestone,Shale
Associated rock:	Seligman Stock
Associated type:	Granodiorite
Structure:	Rocks 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.
Alteration processes:	An 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.

References

DEP	10310557
Reference	{Deposit:: NBMG MI-96}{Deposit:: MI-97}{Deposit:: Map 91}{Deposit:: NBMG Bull 57, 1960}{Deposit:: Myers, 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.}{Deposit:: 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: 23}{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.}
Reporter	LaPointe, D.D., Schruben, Paul G.