Commodities
PrimaryTungsten
SecondaryMolybdenum
TertiarySilver, Gold, Copper, Bismuth
Commodity typeM
Deposit
Deposit typeskarn; vein
Model42: W skarn
Deposit sizeL
Ore controlOre formation was controlled primarily by proximity of limestone beds to igneous intrusive bodies, and secondarily by faulting.
Materials
Ore mineralsScheelite, Powellite, Garnet, Quartz, Pyrite, Wollastonite, Tremolite, Calcite, Diopside
GangueEpidote
Geology
Host rockLimestone,Skarn (Tactite) · Raspberry Formation
Associated rockGranodiorite,Andesite · "Springer Stock", "Olsen Stock"
StructureThe Stank fault strikes N-S for 1.5 miles. Strata strike N20E. The strata on the west side of the fault dip east, while on the east side of the fault, beds dip 70 west. Post-mineral faults also present, in many cases off-setting mineralized skarn beds., Basin and Range faulting
Alterationsilicification, albitization
Economic & production
Development statusProducer
Production years1918-1919; 1925-1958; 1982
First production1918
Last production1982
Discovery year1917
Identification
Deposit ID10310494
Alternate namesSpringer Mine, Humbolt-Springer, Humbolt Mine, Nevada-Massachusetts Mine, Stank and Forge Lease, Summit Mine, Codd Mine, O'Byrne Mine, Keyes Shaft, Friedman, Constantine, Sutton, North Sutton, Sutton No. 2, Orphan, South Sutton, Baker Workings, Uncle Sam Midway
RegionNA
Data scoreB
Coordinates40.78156, -118.1332
References
Kerr, P.F., 1934, Geology of the tungsten deposits near Mill City, Nevada, U. of Nev., Vol 28, No. 2 (NBMG Bull.21), 46 p.Johnson, M.G., 1977, Geology and Mineral Deposits in Pershing County, Nevada: NBMG Bull. 89Kerr, 1946, Tungsten Mineralization in the United States: GSA Memoir 15, 241 p.Stager, H. K and Tingley, J.V., 1988, Tungsten Deposits in Nevada, NBMG Bull. 105.King, W. H. and Holmes, G.H., Jr., 1950, Investigation of Nevada-Massachusetts Tungsten Deposits, Pershing County, NV; USBM Report of Investigations RI 4634, p. 3-4.