4-8-015: hornfels - Pima District - Pima Mine

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Specimen Number4-8-015Alternate NumberP-5CommentsHornfels unit in the lithic arenite group of Triassic (?) metasediments. Hanging wall, is biotized and silicified, veinlets include pyrite, chalcopyrite, and molybdenite. Grade 0.03% Cu, but unit overall averages 0.15 to 0.20% Cu. Occurs near contact of metasediments with Laramide quartz monzonite porphyry, such that origin of biotite is unclear (contact metamorphic vs. hydrothermal). Unit merges seamlessly into quartz monzonite porphyry.In Teaching CollectionNoMineral(s)biotitepyritequartzRock NamehornfelsDistrictPimaMinePimaExternal LinkMindatGeo-LocationNorth side of pitSub-LocationundefinedDeposit TypePorphyry CopperGeo-Coords^[1]Reference MaterialACL-109: Thurmond, R.E., and Storms, W.R., 1958, Discovery and Development of the Pima Copper Deposit, Pima Mining Co., Pima County, Arizona, Bur. Mines Inform. Circ. 7822, 19 p.

ACL-113: Thurmond, R.E., Olk, J.F., Komadina, G.A., Journeay, J.A., Spaulding, E.D., and Hernlund, R.W., 1958, PIMA: a three-part story, Min. Eng., p. 453-462.

ACL-121: Langlois, J.D., 1976, Geology of the Cyprus Pima mine, Pima County, Arizona, in Jenney, J.P., and Hauck, H.R., eds., AZ Geol. Soc. Digest Volume XI, Proceedings of the Porphyry Copper Symposium, Tucson, AZ, March 18-20, p. 103-114.

ACL-153: Cooper, J.R., 1960, Some Geologic Features of the Pima Mining District, Pima County, Arizona; U.S. Geol. Surv. Bull. 1112-C, Washington, D.C., 40 p.

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4-8-015: hornfels - Pima District - Pima Mine