Description
U.S. Minerals Exploration, Inc. (USMX)
Commodities
PrimaryGold
SecondarySilver
TertiaryLead, Zinc, Iron, Barium-Barite
Commodity typeB
Deposit
Deposit typeDISSEMINATED
Model173: Sediment-hosted Au
Deposit sizeS
Ore controlThe north -northeast alignment of ore zones is believed to be related to a deep, unrecognized "feeder fault", perhaps coincident with the synclinal axis just west of the ore zones. This is conjectural as no single major fault system connecting the individual ore shoots has been identified.
Materials
Ore mineralsGold
GangueLimonite, Scorodite, Stibiconite, Barite, Jarosite, Pyrite, Sphalerite, Galena
Geology
Host rockLimestone · Chainman Shale
StructureIn the mine area, three prominent sets of nearly vertical faults have been mapped, trending north-northeast, east-northeast, and northwest. The north-northeast set parallels the present range front, a conspicuous topographic lineament which corresponds to the main ore trend, the major fold axes, and the bonanza silver veins of the Treasure Hill mine. Northeast- and northwest- striking faults are both pre- and post-ore. Offsets on these faults generally measure only a few meters., North-trending folds; Green Springs Thrust Fault.
AlterationRocks in the mine area have been silicified and argillized. Silicification in the form of bedding- controlled jasperoid is on a district scale and is not a guide to the proximity of ore. Argillization is structurally controlled and is widespread in both productive and unmineralized areas. Within the ore zones, gold grades are independent of the intensity of argillization. Argillization is comprised of 7a-halloysite, kaolinite, and sericite. Argillization postdates silicification.
Economic & production
Development statusProducer
Production years1988-1991
First production1988
Last production1991
Discovery year1986
Identification
Deposit ID10310555
Alternate namesC orebody, D orebody, North C orebody
RegionNA
Data scoreB
Coordinates39.14132, -115.55449
References
NBMG mining district file 344, numerous press clippings.Scoping document for US Minerals Exploration Co.'s proposed Green Springs Mine development, NBMG file White Pine general, item 63, 1987.Wilson, W.R., Cox, J.W., Lance, D.L., 1991, Geology and geochemistry of the Green Springs Gold Mine, White Pine County, Nevada, in Raines, G.L., et al., eds., Geology and ore deposits of the Great Basin, the Geological Society of Nevada, Reno, p. 687-700.NBMG, 1994, MI-1993Long, 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.