Commodities
PrimaryGold
SecondarySilver
Commodity typeM
Deposit
Deposit typeplacer; breccia and vein-stockwork system
Model119: Placer Au-PGE150: Epithermal vein, Comstock
Deposit sizeM
Orebody formchannels, blanket
Ore controlStratigraphically limited to gravel beds
Materials
Ore mineralsGold
GangueClay, Gravel
Geology
Host rockGravel,Rhyolite · Rochester Rhyolite of Koipato Group
Associated rockClay, Mud
Economic & production
Development statusProducer
Production years1880-1895,1910-1914,1920s , 1930s, 1980s
First production1875
Last production1984
Discovery year1875
Identification
Deposit ID10310357
MRDS IDM060380
Alternate namesSpring Valley Placers, Horseshoe Mine
RegionNA
Data scoreB
Coordinates40.33684, -118.11069
References
Johnson, 1977, Geology and Mineral Deposits of Pershing County, Nevada: NBMG Bull. 89Vanderburg, 1936, Reconnaissance of Mining Districts in Pershing County, Nevada: USBM IC 6902Schrader, F.C., 1914, The Rochester Mining District, Nevada; USGS Bull. 580-MVikre, P.G., 1978, Geology & and Silver Mineralization of the Rochester District, Pershing County, Nevada; Ph.D. Thesis Stanford Univ.Vanderburg, 1936, Placer Mining in Nevada; NBMG Bull. 30NBMG Staff, 1985, NBMG OFR 85-3.Bonham, H. F., Jr., 25 Sep 84, NBMG Field Examination of the PlacersDivision of Mine Inspection, Aug 1985, Directory of Nevada Mine Operations Active During Calendar Year 1984.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.website: http://www.midwaygold.com.Midway Gold Corp. press release, Sept. 2006.