Mine detail: Coeur Rochester Mine

Previously called 'Rochester MineNenzel HillEast pitWest pit'

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Location

Lat / long: 40.29073, -118.14153

Resource(M)

Primary: Silver, Gold
Secondary: Lead, Zinc, Copper, Antimony
Ore: Pyrite, Sphalerite, Tetrahedrite, Arsenopyrite, Chalcopyrite, Galena, Covellite, Chalcocite, Stromeyerite, Polybasite, Pyrargyrite, Acanthite, Argentite, Argentojarosite, Chlorargyrite, Embolite, Silver, Chalcophanite, Melanterite, Anglesite, Chalcanthite, Pyrrhotite, Teallite, Owyheeite, Electrum, Feldspar, Sericite, Limonite, Hematite, Goethite, Clay
Gangue: Quartz
Orebody form: tabular, pipelike, blanket, irregular, disseminated
Discovery year: 1905

Production

Operation type: Surface-Underground
Deposit type: hydrothermal stringer zone
Production size: Large
Development status: Producer
Production years: 1912-1928; 1986-2004
First production started: 1912

Geology

Host rock:Rochester Rhyolite, Koipato Group, Weaver Formation, Koipato Group
Host type:Rhyolite,Volcanic Breccia (Agglomerate),Trachyte,Mixed Clastic/Volcanic Rock
Structure:Rocks are folded into a broad, asymmetrical anticlinal arch., There are 2 major normal fault systems and post- mineral faults.
Alteration processes:Silicification and oxidation are prevalent in the deposit.

References

MRDSM060371
DEP10310354
Reference{Deposit:: Strusacker, E., (ed.), 1993, Gold and Silver Deposits of Western Nevada: Geological Society of Nevada Special Publication No.18, 1993 Fall Field Trip Guide}{Deposit:: Schrader, F.C., 1914, The Rochester Mining District, Nevada: USGS Bulletin 580-M}{Deposit:: Knopf, A., 1924, Geology and Ore Deposits of the Rochester District, Nevada: USGS Bulletin 762, pp.78-81}{Deposit:: Vikre, P.G., 1977, Geology and Silver Mineralization of the Rochester District, Pershing County, Nevada: Stanford University, Unpublished Phd. Dissertation}{Deposit:: Vikre, P.G., 1981, Silver Mineralization of the Rochester District, Pershing County, Nevada: Economic Geology, v.76, pp 580-609}{Deposit:: Johnson, M.G., 1977, Geology and Mineral Deposits of Pershing County, Nevada: NBMG Bulletin 89, Pp.78-80}{Deposit:: Bonham, H.F. and Hess, R.H., 1993, in, The Nevada Mineral Industry-1992: NBMG Special Publication MI- 1992-2002 p26}{Deposit:: Tingley, J.V., 1985, Nenzel Hill, NBMG Sample 2645, Pershing County, Rochester District; NBMG Unpublished Mining District (Tingley) Files}{Deposit:: Nevada Bureau Of Mines And Geology, Mining District Files, Various Clippings, 1983-1985}{Deposit:: Minsearch Annual, 1984-1985, v. vii, pp 380-384; Metals Economics Group, Boulder, CO}{Deposit:: Bonham, H.F., Garside, L.J., Jones, R.B., Papke, K.G., Quade, J., Tingley, J.V., 1985, A Mineral Inventory of the Paradise-Denio and Sonoma-Gerlach, Winnemucca BLM District, Nevada: NBMG Open File Report 85-5}{Deposit:: NBMG, 1994, MI-1993}{Deposit:: Nevada Division of Minerals, 1994}{Deposit:: Coeur *lene Mines Corp.,1997 Annual Report.}{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:: Crafford, A.E.J. (ed.), 2003, GSN Road Log 44, Coal Canyon Road East from I-80 Exit 112.}{Deposit:: Coeur *lene Mines Corp, press release, 5/14/02}{Deposit:: The Mining Record, 8/13/02.}{Deposit:: Harvey, David, Chadwick, Thomas, and Krewedl, Dieter, 2002, Geology and Mineralization in the Rochester and Nevada Packard Deposits, in Geological Society of Nevada Fall 2002 Field Trip Guidebook, Precious Metals Deposits of the Humboldt Range, New Discoveries in an Old District; GSN Special Publication No. 36.}
ReporterSchruben, Paul G., LaPointe, D. D.