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Arizona Central Mine (Detroit Copper Co. group [in part]; Arizona Central vein; Copper Mountain tunnel), Copper Mountain District (Clifton-Morenci District), Shannon Mts, Greenlee Co., Arizona, USA
Latitude: 33°4'36"N
Longitude: 109°22'5"W
Longitude: 109°22'5"W
Mineralization is an irregular ore body hosted in the Modoc Limestone, Morenci Shale and Longfelow Limestone. Associated rock units are the Morenci Granite Porphyry and the Coronado Quartzite. Ore control was the NE-trending Williams vein, which follows a porphyry dike of greatly varying width. Ore is concentrated along the contact between the sedimentary rocks and porphyry The lode follows the Apache fault zone onn the SE side of the property. Ore concentration was extensive surface leaching zone immediately adjoined by chalcocite ore bodies. Cuprite occurs at the upper limit of the chalcocite zone near the contact of porphyry and metamorphic rock (at depths of 200 to 300 feet) as a decomposition product of chalcocite. Secondary enrichment occurred along fissure veins. Alteraton includes sericitization of granite with the introdction of pyrite and chalcopyrite in veinlets.
Area structures include E-trending fissre veins. A porphyry dike of 500 feet maximum width cnnects in tw places with the main porphyry mass of Copper Mountain. NE-trending fissure veins are partly in porphyry and partly in contact-metamorphosed limestones. veins occasionally outcrop on the surface. The Apache Fault, striking N45°W, 65°NE, is associated with the faults that cut the deposit.
Tectonic component is the complex Copper Mountain Fault System with substantial vertical displacement. Falt blocks generally downthrow to the NE.
Mineral List
| Chalcocite Chalcopyrite Cuprite Epidote | 'Garnet' Goslarite Limonite Magnetite | Malachite Muscovite var: Sericite Nontronite Pyrite | 'Pyroxene Group' Sphalerite Tremolite |
15 entries listed. 11 valid minerals.
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References
Lindgren, W. (1905), The copper deposits of the Clifton-Morenci district, Arizona, USGS PP 43.
Guild, F.N. (1910), The Mineralogy of Arizona, The Chemical Publishing Co., Easton, PA.
Schwartz, G.M. (1947), Hydrothermal alteration in the 'porphyry copper' deposits, Economic Geology: 42: 319-352.
Schwartz, G.M. (1958), Alteration of biotite under mesothermal conditions, Economic Geology: 53: 164-177.
Galbaith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 39, 61, 110.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 238, 284, 314.
MRDS database Dep. ID #10111298, MRDS ID #M800414.
Guild, F.N. (1910), The Mineralogy of Arizona, The Chemical Publishing Co., Easton, PA.
Schwartz, G.M. (1947), Hydrothermal alteration in the 'porphyry copper' deposits, Economic Geology: 42: 319-352.
Schwartz, G.M. (1958), Alteration of biotite under mesothermal conditions, Economic Geology: 53: 164-177.
Galbaith, F.W. & D.J. Brennan (1959), Minerals of Arizona: 39, 61, 110.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 238, 284, 314.
MRDS database Dep. ID #10111298, MRDS ID #M800414.
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New Locality Added: Attu, Pargas (Parainen), Southwestern Finland Region, FinlandFrom Ilkka Mikkola, 24th May 2013 06:15:27