Mine detail: Grand Island-Caribou District

Previously called 'Caribou CardinalEldora Nederland Grand Island '

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Location

Lat / long: 39.9811, -105.57892

Resource(M)

Primary: Silver, Lead, Gold
Secondary: Zinc, Copper
Tertiary: Uranium, Titanium
Ore: Argentite, Chalcopyrite, Galena, Pyrargyrite, Silver, Sphalerite, Titaniferous Magnetitite, Pitchblende, Cerargyrite
Gangue: Pyrite, Quartz

Production

Operation type: Surface-Underground
Development status: Past Producer

Geology

Host rock:Caribou stock
Host type:Monzogabbro
Associated rock:Idaho Springs Formation, Boulder Creek Granite
Associated type:Schist,Gneiss,Granitoid
Structure:ore shoots localized at vein junctions and by changes in dip or strike
Alteration processes:silicified, pyritized, argillized, and chloritized wall rock

References

DEP10141356
Reference{Commodity:: Moore, F. B., Cavender, W. S., and Kaiser, E. P., 1957, Geology and uranium deposits of the Caribou area, Boulder County, Colorado: U.S. Geological Survey Bulletin 1030-N, pp. 517-552.}{Commodity:: Harrer, C.M., and Tesch, W.J., Jr., 1959, Reconnaissance of iron occurrences in Colorado, U.S. Bureau of Mines Information circular 7918, 82 p.}{Deposit:: MINE MAP REPO # 409114}{Deposit:: Vanderwilt, J.W., 1947, Mineral resources of Colorado: State of Colorado Mineral Resources Board, 547 p.}{Deposit:: Sunshine Mining Co. Colorado exploration files, unpublished data, Colorado Geological Survey.}{Deposit:: Smith, D. A., 2003, Silver saga, the story of Caribou, Colorado (rev. ed.): Boulder, University Press of Colorado, 230 p.}{Geology:: Lovering, T. S., and Goddard, E. N., 1950, Geology and Ore Deposits of the Front Range, Colorado: U.S. Geological Survey Professional Paper 223, 319 p.}{Names:: Dunn, L.G, 2003, Colorado mining districts: A reference: Golden, Colo., Colorado School of Mines Library, 364 p.}{Reserve-Resource:: Calais Resources corporate info., accessed from internet on 12/20/2005.}
ReporterBeach, Richard A.