Mine detail: Railroad Copper-Gold Property

Previously called 'Bullion Copper-Gold ProjectPolymetallic prospectNevada Bunker Hill MinesAladdin ClaimBlue Sky ClaimTripoli ClaimWebfoot ClaimMahogany ClaimStanding Elk ClaimHoffman ClaimMounted Ledge ClaimBullion ClaimCleveland ClaimPortal Claim'

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Location

Lat / long:

40.51658, -116.01063

Resource(B)

Primary:	Copper, Gold
Secondary:	Silver, Zinc, Lead
Tertiary:	Tungsten, Barium-Barite
Ore:	Malachite, Chalcanthite, Cerussite, Cerargyrite, Duftite, Azurite, Galena, Bornite, Chalcopyrite, Sphalerite, Chalcocite, Tetrahedrite, Scheelite, Pyromorphite
Gangue:	Calcite, Garnet, Tremolite, Quartz, Fluorite, Wollastonite, Halloysite, Pyrite, Barite
Orebody form:	tabular to irregular
Discovery year:	1870

Production

Operation type:	Surface-Underground
Deposit type:	replacement, veins
Production size:	Medium
Development status:	Past Producer
First production started:	1870
Last production ended:	1959

Geology

Host rock:	Devils Gate Limestone (copper host rock), Webb Formation siltstone (gold host rock)
Host type:	Limestone,Skarn (Tactite),Siltstone
Associated rock:	Chainman Shale
Associated type:	Quartz Monzonite,Porphyry
Structure:	North- to northeast-trending Bunker Hill fault; E-W-trending Bald Mountain fault
Alteration processes:	sericitization, silicification

References

MRDS	M233382
DEP	10310317
Reference	{Deposit:: Ketner, K.B., and Smith, Jr., J.F., Geology of the Railroad Mining District, Elko County, Nevada. USGS Bulletin 1162-B}{Deposit:: Smith, R.M., Mineral Resources of Elko County, Nevada, USGS Open File Report, 1976-56}{Deposit:: Granger, A.E., et al., 1957, Geology and Mineral Resources of Elko County, Nevada, NBMG Bulletin 54}{Deposit:: Emmons, W.H., 1910, A Reconnaissance of some Mining Camps of Elko, Lander, and Eureka Counties, Nevada. USGS Bulletin 408.}{Deposit:: Mines Register, 1937.}{Deposit:: La Pointe and others, 1991, NBMG Bull. 106}{Deposit:: NBMG MI-96; MI-97.}{Deposit:: Long, K.R., DeYoung, J.H., Jr., and Ludington, S.D., 1998, Significant deposits of gold, silver, copper, lead, and zinc in the United States: U.S. Geological Survey Open-File Report 90-206A, 33 p.; 98-206B. one 3.5 inch diskette.}{Deposit:: Royal Standard Minerals website, 2006 http://www.royalstandardminerals.com/}
Reporter	LaPointe, D.D., Schruben, Paul G.