Mine detail: Robinson Mine

Previously called 'Aultman PitKimberly PitLiberty PitRuth PitTripp PitVeteran PitWedge PitVeteran ExtensionTwin PeaksPuritanPilot KnobNorthwest RuthNew LibertyNellieLos AngelesKranovichJ. D. HillAlphaRob RoyRobinson Gold'

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Location

Lat / long: 39.25661, -114.99948

Resource(M)

Primary: Gold, Copper
Secondary: Molybdenum
Ore: Chalcocite, Chalcopyrite, Molybdenite, Chrysocolla, Malachite, Azurite, Cuprite, Copper, Bornite, Sphalerite, Galena
Gangue: Pyrite, Chalcopyrite, Argentite, Sericite, Clay, Fluorite, Quartz, Magnetite, Limonite
Orebody form: variable from tabular to blanket to disseminated
Discovery year: 1868

Production

Operation type: Surface-Underground
Deposit type: Porphyry Cu-Au
Production size: Large
Development status: Producer
Production years: Late 180*-1978, 1986-1999, 2005-present
First production started: 1860
Last production ended: 2009

Geology

Host rock:Ely Limestone, Chainman Shale
Host type:Limestone,Porphyry,Quartz Monzonite,Siltstone,Sandstone
Associated rock:Weary Flat quartz monzonite
Associated type:Porphyry,Quartz Monzonite,Rhyolite
Structure:Host rocks have been folded, faulted, and fractured. Mineralization follows fractures in some cases., Rocks in the are folded into na east-trending anticline with moderate to gentle dipping flanks, later intruded by pluton and cut by nomal faults.
Tectonic:Paleozoic Cordillerian miogeosyncline
Alteration processes:Most significant is the hydrothermal alteration from monzonite intrusion. The deposit generally follows the typical porphyry copper deposit model in the pattern of alteration and mineralization. Anhydrous skarn developed in sedimentary rocks adjacent to potassically altered quartz monzonite. Peripheral to this is a quartz-sericite alteration zone followed by a quartz-clay-pyrite zone. Lacally present are advanced argillic alteration and some formation of retrograde hydrous skarn.

References

MRDSW700594
DEP10310402
Reference{Age:: McDowell, F.W., and Kulp, J.L., 1967, Age of intrusion and ore deposition in the Robinson mining district of Nevada: Economic Geology, v. 62, p. 905?909}{Deposit:: The Geological Society of Nevada 1996 Spring Field trip, Geology and Gold Deposits of Eastern Nevada, GSN Special Publication No. 23.}{Deposit:: Wilson, W. R., 1978, Geology of the Robinson Mining District, Nevada, Nevada Bureau of Mines and Geology Report 32, pp. 55 - 61.}{Deposit:: Spencer, A. C., 1917, The Geology and Ore Deposits of Ely, Nevada, USGS Professional Paper 96, 189 pp.}{Deposit:: Mining Magazine, January 1989, p. 44.}{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:: Durgin, Dana, 1989, Alta Gol* Robinson Project, in GSN Special Pub. #9, Geology and Mineral Deposits of White Pine County, 1989 Spring Field Trip Guide Book, eds. Schafer and Buffa.}{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:: Quadra Mining Ltd. news releases, 8/11/2004, 2/22/2005.}{Deposit:: NBMG MI-2004.}{Deposit:: http://www.quadramining.com/s/RobinsonMine.asp}{Geology:: Westra, G., 1982, Alteration and mineralization in the Ruth porphyry copper deposit near Ely, Nevada, Economic Geology; v. 77; no. 4; p. 950-970}{Geology:: Bauer, H.L., Jr., Breitrick, R.A., Cooper, J.J., and Anderson, J.A., 1966, Porphyry copper deposits in the Robinson mining district, Nevada, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Univ. of AZ Press, Tucson, AZ}{Geology:: Einaudi, M.T., 1982, Description of skarns associated with porphyry copper plutons, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 139-183.}{Geology:: James, L.P., 1976b, Zoned alteration in limestone at porphyry copper deposits, Ely, Nevada: Economic Geology, v. 71, p. 488?512.}{Geology:: James, L.P., 1990, Gold in the Ely (Robinson) copper district, White Pine County, Nevada: U.S. Geological Survey Bulletin 1857?E, p. E28?E42.}{Geology:: Maher, David, 1996, Stratigraphy, structure, and alteration of igneous and carbonate wall rocks at Veteran Extension in the Robinson (Ely) porphyry copper district, Nevada, in Coyner, A.R., and Fahey, P.L., eds., Geology and ore deposits of the American Cordillian}{Geology:: Seedorff, E., 1993, Robinson mining district geology and mineralization, summer field trip: Geological Society of Nevada Special Publication 17, 69 p.}{Geology:: Shaver, S.A., and Jeanne, R.A., 1996, The geology and evolution of the weakly Au-(Cu)-mineralized far eastern side of the Robinson mining district, Ely, Nevada, in Coyner, A.R., and Fahey, P.L., eds., Geology and ore deposits of the American Cordillera}{Geology:: Westra, G., 1979b, Porphyry copper genesis at Ely, Nevada, in Ridge, J.D., ed., Papers on mineral deposits of Western North America, The International association on the genesis of ore Deposits, Fifth Quadrennial Symposium Proceedings, v.2: Nevada Bureau of Mines}{Ownership:: http://www.quadramining.com/i/pdf/RobinsonNI43-101Final.pdf}{Production:: Production Results from Quadra Mining Ltd. http://www.quadramining.com/s/RobinsonMine.asp}{Reserve-Resource:: http://www.quadramining.com/i/pdf/RobinsonNI43-101Final.pdf, pg 68}{Reserve-Resource:: Revised Reserve Table as of Janurary 1, 2006 http://www.quadramining.com/i/pdf/2006-01-20_NR.pdf}
ReporterLaPointe, D.D., Schruben, Paul G.