Mine detail: Mill City Tungsten Mine

Previously called 'Springer MineHumbolt-SpringerHumbolt MineNevada-Massachusetts MineStank and Forge LeaseSummit MineCodd Mine
*yrne MineKeyes ShaftFriedmanConstantineSuttonNorth SuttonSutton No. 2OrphanSouth SuttonBaker WorkingsUncle Sam Midway'

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Location

Lat / long:

40.78156, -118.1332

Resource(M)

Primary:	Tungsten
Secondary:	Molybdenum
Tertiary:	Silver, Gold, Copper, Bismuth
Ore:	Scheelite, Powellite, Garnet, Quartz, Pyrite, Wollastonite, Tremolite, Calcite, Diopside
Gangue:	Epidote
Discovery year:	1917

Production

Operation type:	Surface-Underground
Deposit type:	skarn; vein
Production size:	Large
Development status:	Producer
Production years:	1918-1919; 1925-1958; 1982
First production started:	1918
Last production ended:	1982

Geology

Host rock:	Raspberry Formation
Host type:	Limestone,Skarn (Tactite)
Associated rock:	Springer Stock, Olsen Stock
Associated type:	Granodiorite,Andesite
Structure:	The 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
Alteration processes:	silicification, albitization

References

DEP	10310494
Reference	{Deposit:: 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.}{Deposit:: Johnson, M.G., 1977, Geology and Mineral Deposits in Pershing County, Nevada: NBMG Bull. 89}{Deposit:: Kerr, 1946, Tungsten Mineralization in the United States: GSA Memoir 15, 241 p.}{Deposit:: Stager, H. K and Tingley, J.V., 1988, Tungsten Deposits in Nevada, NBMG Bull. 105.}{Deposit:: 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.}
Reporter	LaPointe, D.D., Schruben, Paul G.