Mine detail: Spring Valley Project

Previously called 'Spring Valley PlacersHorseshoe Mine'

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Location

Lat / long: 40.33684, -118.11069

Resource(M)

Primary: Gold
Secondary: Silver
Ore: Gold
Gangue: Clay, Gravel
Orebody form: channels, blanket
Discovery year: 1875

Production

Operation type: Surface
Deposit type: placer; breccia and vein-stockwork system
Production size: Medium
Development status: Producer
Production years: 1880-1895,1910-1914,1920s , 1930s, 1980s
First production started: 1875
Last production ended: 1984

Geology

Host rock:Rochester Rhyolite of Koipato Group
Host type:Gravel,Rhyolite
Associated type:Clay, Mud

References

MRDSM060380
DEP10310357
Reference{Deposit:: Johnson, 1977, Geology and Mineral Deposits of Pershing County, Nevada: NBMG Bull. 89}{Deposit:: Vanderburg, 1936, Reconnaissance of Mining Districts in Pershing County, Nevada: USBM IC 6902}{Deposit:: Schrader, F.C., 1914, The Rochester Mining District, Nevada; USGS Bull. 580-M}{Deposit:: Vikre, P.G., 1978, Geology & and Silver Mineralization of the Rochester District, Pershing County, Nevada; Ph.D. Thesis Stanford Univ.}{Deposit:: Vanderburg, 1936, Placer Mining in Nevada; NBMG Bull. 30}{Deposit:: NBMG Staff, 1985, NBMG OFR 85-3.}{Deposit:: Bonham, H. F., Jr., 25 Sep 84, NBMG Field Examination of the Placers}{Deposit:: Division of Mine Inspection, Aug 1985, Directory of Nevada Mine Operations Active During Calendar Year 1984.}{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:: website: http://www.midwaygold.com.}{Deposit:: Midway Gold Corp. press release, Sept. 2006.}
ReporterJohnson, Maureen G., Western Field Operations Center (WFOC), La Pointe, D.D. (Tingley, J.V.), LaPointe, D.D., Schruben, Paul G.