TC-1-3-003: altered granodiorite - San Manuel District - San Manuel Mine

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Specimen NumberTC-1-3-003Alternate NumberSM-3 4-8-043CommentsOracle quartz monzonite, Precambrian host to San Manuel system. Sample from only a few tens of feet from the ore zone in well-developed phyllic alteration. Megascopically, rock consists of quartz, sericite, abundant pyrite, and minor chalcopyrite. In thin section, some weakly birefringent sericite or kaolinite may persist here but K-feldspar, plagioclase, and mafic silicates have all been replaced by sericite. Pyrite occurs as pervasive disseminations as well as along fractures and can reach 15%. Quartz occurs in veinlets as well as intergrown with sericite. Classic phyllic alteration.In Teaching CollectionYesMineral(s)chalcopyritepyritequartzsericiteRock Namealtered granodioriteDistrictSan ManuelMineSan ManuelExternal LinkMindatDeposit TypePorphyry CopperReference MaterialACL-110: Mine staff San Manuel Division, 1963, Magma Copper Company San Manuel Division General Information Booklet, internal company report, 21 p.

ACL-111: Mine staff San Manuel Division, 1969, Magma Copper Company San Manuel Division General Information Booklet, internal company report, 11 p.

ACL-112: Mine staff San Manuel Division, 1970, Magma Copper Company San Manuel Division General Information Booklet, internal company report, 14 p.

ACL-173: Anzalone, S.A., Beane, R.E., Davis, S.R., Graybeal, F.T., Guilbert, J.M., Oakley, C.A., Titley, S.R., and West, R.M., org., 1979, Society of Economic Geology Field Conference on Tucson-Area Porphyry Copper Deposits, Tucson, AZ, May 3-6, 1979, 205 p.

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TC-1-3-003: altered granodiorite - San Manuel District - San Manuel Mine

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TC-1-3-003: altered granodiorite - San Manuel District - San Manuel Mine