Little Bald Mountain Mine

White Pine County, Nevada, United States

GoldSilverMercury

⌖ Show on map USGS source ↗

Commodities

PrimaryGold, Silver

TertiaryMercury

Commodity typeM

Deposit

Deposit typesediment-hosted disseminated gold

Model75: Distal disseminated Ag-Au

Deposit sizeS

Ore controlShear zones; the East Fault

Materials

Ore mineralsGold, Pyrite, Clay, Limonite

Geology

Host rockSedimentary Rock · Antelope Valley Limestone

Associated rockQuartz Monzonite,Porphyry · Bald Mountain Stock

StructureThe 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., The rocks in the mine area have been affected by N-trending faults and less prominent W-trending fractures.

Tectonic settingThe 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.

AlterationAlteration at the mine property consists predominantly of argillization and sericitization of igneous rocks, and sillicification of host rocks.

Economic & production

Development statusProducer

First production1985

Last production2004

Discovery year1984

Identification

Deposit ID10310383

MRDS IDM242962

Alternate namesLBM Claims, North pit, South pit, Little Bald Mountain II, Lbm Mine

RegionNA

Data scoreA

Coordinates39.91793, -115.54733

References

NBMG MI-86 through MI-02NBMG Map 91, 1st, 2nd, 3rdDEIS, 1995FEIS, 1995Hitchborn 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.The Geological Society of Nevada 1996 Spring Field trip, Geology and Gold Deposits of Eastern Nevada, GSN Special Publication No. 23MASMILS 0320330513; Nevada Land Status, 1990www.placerdome.comAmer. Mines (1989) through Amer. Mines (1991-92)NBMG Mining District Files 323, PressGSN 1985 Meeting and Fall Field Trip Road LogAdamson, T.J., 1987, in Bulk Mineable Precious Metal Deposits of the Western U.S., 1987 GSN, Field Trip Guidebook and Technical Volume.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.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.BLM, 2004, Bald Mountain Mine Exploration Program Programmatic Environmental Assessment NV040-04-023, Case File # N78825.NEVADA BUREAU OF MINES & GEOLOGY, SPE. PUB. 10, 1990, P16.RANDOL MINING DIRECTORY, 1994/95, U.S. MINES & MINING COMPANIES, P331.RANDOL MINING DIRECTORY, 1996/97, U.S. MINES & MINING COMPANIES, P254.AMERICAN MINES HANDBOOK, 1996, P181.