Mine detail: Cove - McCoy Gold Mine

Previously called 'Peacock ZoneCoveMcCoyBrown ZoneCove EastEast Brown ZoneGold Dome ZoneEcho Bay Mine'

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Location

Lat / long: 40.33629, -117.20233

Resource(M)

Primary: Gold, Silver
Secondary: Copper
Tertiary: Manganese, Arsenic, Mercury, Antimony, Thallium, Lead, Zinc, Tin
Ore: Electrum, Silver, Canfieldite, Tetrahedrite, Tennantite, Acanthite, Galena, Pyrite, Chalcopyrite, Cerargyrite, Malachite, Cerrusite, Gold, Chalcocite
Gangue: Clay, Sericite, Sphalerite, Cassiterite, Stannite, Pyrrhotite, Arsenopyrite, Digenite, Covellite, Chatkalite, Quartz, Jasper, Calcite, Garnet, Pyroxene, Epidote, Zeolite, Chlorite
Orebody form: replacement; stockwork; tabular to irregular or stratiform
Discovery year: 1914

Production

Operation type: Surface
Deposit type: Distal Disseminated/Pluton-related; vein; skarn
Production size: Medium
Development status: Producer
Production years: McCoy mine 1914 - 2004, Cove mine 1988 - 1992
First production started: 1925
Last production ended: 2004

Geology

Host rock:Favret Formation, Home Station Member of Augusta Mountain Formation, Panther Canyon Member of Augusta Mountain Formation, Smelser Pass Member of Augusta Mountain Formation, Augusta Mountain Formation
Host type:Limestone,Dolomite,Sandstone,Conglomerate,Diorite
Associated type:Granodiorite
Structure:faults
Tectonic:Post-Sonoma orogeny overlap passive margin sequence.
Alteration processes:Upper ore zone alteration consists of argillization, silicification, amd manganese alteration. Alteration has resulted in the formation of clay and sericite along fractures and within the more permeable beds. Locally, complete replacement of the carbonate to form jasperoid has occurred along bedding and along some structures. Abundant manganese (as manganoan calcite) has been introduced into the rock, giving the clay and jasperoid a sooty brown appearance. Lower ore zone: base metal sulfides and pyrite were introduced into the host rock, filling fractures and partially replacing the host rock.

References

MRDSW700450
DEP10310331
Reference{Deposit:: Emmons, D.L, 1989, The Cove Gold-Silver Discovery, Lander County, Nevada, Oral Presentation At 118th Annual Meeting of AIME, Las Vegas, March 2.}{Deposit:: Emmons, D.L., and Coyle, R.D., 1988, Echo Bay Details Exploration Activities at its Cove Deposit in Nevada; Mining Engineering,, August, 1988, p. 791-794.}{Deposit:: NBMG Mining District File 157, item 12, unpublished report by Echo Bay Mines, and numerous press Clippings.}{Deposit:: Bonham, H.F., 1988, NBMG MI-1987.}{Deposit:: Engineering and Mining Journal, June, 1988, p. 43.}{Deposit:: NBMG, 1994, MI-1993}{Deposit:: 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.}{Deposit:: Felix E. Mutschler, Steve Ludington, and Arthur A. Bookstrom, 1999, Giant Porphyry-Related Metal Camps of the World-A Database; USGS Open-File Report 99-556.}{Deposit:: Marcus K. Johnston, 1999, Structural and stratigraphic controls on hypogene alteration and precious metals distributions at the Cove gold-silver mine, Nevada; GSN Newsletter, May, 1999.}{Deposit:: Stager, H.K. (1977) Geology and Mineral Resources of Lander Co., N.B.M. Bull 88}{Deposit:: Burgess J.A. (1914) Report on Camp McCoy, Lander Co. Nev., N.B.M. District file 157, item 1}{Deposit:: Lane, M.F., 1987, Geology and Mineralization of The McCoy Skarn, Lander Co., Nevada; Unpub. paper presented at 93rd NW Mining Assoc. Convention, 1987.}{Deposit:: Unpub. report by Echo Bay Mines, on file at NBMG, mining district file 157.}{Deposit:: Kuyper, B.A., 1986, Geology of the McCoy Gold Deposit, GSN Precious Metals Symposium Paper.}{Deposit:: Shrader, F.C., 1934, USGS IC. #10.}{Deposit:: Bonham, H.F., 1986, NBMG Map 91.}{Deposit:: Smith, P. and Bentz, J., Nov, 1981, NBMG Field Examination Report.}
ReporterLaPointe, D.D., Schruben, Paul G.