Mine detail: LJ Ridge Deposit

Previously called 'Bald Mountain Mine Project'

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Location

Lat / long:

39.96659, -115.59589

Resource(M)

Primary:	Gold, Silver
Tertiary:	Copper, Zinc, Arsenic, Antimony, Mercury, Bismuth, Tellurium
Ore:	Gold
Gangue:	Quartz, Pyrite, Arsenopyrite, Sericite, Sphalerite, Chalcopyrite, Tetrahedrite, Galena
Orebody form:	tabular to irregular.

Production

Operation type:	Surface
Deposit type:	sediment-hosted gold
Production size:	Small
Development status:	Producer
Production years:	1983; 1985 - 2000
First production started:	1983
Last production ended:	2000

Geology

Host rock:	Dunderberg Shale, Windfall Formation
Host type:	Shale,Limestone
Associated rock:	Bald Mountain Stock
Associated type:	Quartz Monzonite,Lamprophyre,Aplite
Structure:	The Bald Mountain district is located in an area of thinned crust along the eastern side of the Late Proterozoic rift that split the North American craton. It is also in the west-central portion of the Late Devonian-Early Mississippian Antler foreland basin, and near the eastern edge of deformation related to the late Paleozoic Humboldt orogeny To the west of the Bald Mountain district, geologic interpretations are dominated by recognition of Paleozoic deformation, whereas to the east, interpretations emphasize Mesozoic contraction and plutonism and Tertiary extension.
Tectonic:	The Bald Mountain district is located in an area of thinned crust along the eastern side of the Late Proterozoic rift that split the North American craton. It is also in the west-central portion of the Late Devonian-Early Mississippian Antler foreland basin, and near the eastern edge of deformation related to the late Paleozoic Humboldt orogeny.
Alteration processes:	Alteration consists predominantly of silicification, argillization, and potassic alteration.

References

DEP	10310447
Reference	{Deposit:: Hitchborn and others, 1996, Geology and Gold Deposits of the Bald Mountain Mining District, White Pine County, Nevada, in Geology and Ore Deposits of the American Cordillera Symposium Proceedings, eds. A. Coyner and P. Fahey.}{Deposit:: The Geological Society of Nevada 1996 Spring Field trip, Geology and Gold Deposits of Eastern Nevada, GSN Special Publication No. 23.}{Deposit:: Hose, Blake, and Smith, 1976, Geology and Mineral Resources of White Pine County, Nevada, NBMG Bulletin 85.}{Deposit:: Hill, J. M., 1916, Notes on some Mining Districts in Eastern Nevada, USGS Bull. 648, p. 152-161.}{Deposit:: Dean, D. A., Benedetto, K. M. F., Durgin, D. C., 1991, Part Two: Ely - Bald Mountain - Ely Road Log, in Buffa, R. and Coyner, A., eds., Geology and Ore Deposits of the Great Basin - Field Trip Guidebook Compendium, The Geological Society of Nevada, Reno, p. 136-162. 1981.}{Deposit:: NBMG Map M84.}{Deposit:: NBMG, 1994, MI-1993}{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.}{Deposit:: Nutt, C.J., Hofstra, A.H., Hart, K.S., and Mortensen, J.K., 2000, Structural setting and genesis of gold deposits in the Bald Mountain-Alligator Ridge area, east-central Nevada, in Cluer, J.K., Price, J.G., Struhsacker, E.M., Hardyman, R.F., and Morris, C.L., eds., Geology and Ore Deposits 2000: The Great Basin and Beyond: Geological Society of Nevada Symposium Proceedings, May 15-18, 2000, p. 513-537.}{Deposit:: BLM, 2004, Bald Mountain Mine Exploration Program Programmatic Environmental Assessment NV040-04-023, Case File # N78825.}
Reporter	LaPointe, D. D. , Schruben, Paul G.