5-3-002: quartz monzonite - Silver Bell District - Silver Bell Mine

Details

Specimen Number5-3-002Alternate NumberSB-2CommentsSilver Bell alaskite, probably a variation of the Silver Bell quartz monzonite. Two alteration events present: first, hypogene phyllic and/or quartz + sericite + pyrite, and second, supergene alteration. The phyllic event affects all feldspars, with only sparse relict K-spar left. Plagioclase is completely, and orthoclase largely, converted to fine-grained sericite + quartz. Hypogene pyrite was likely there, but obliterated by supergene event and is now limonite. The supergene event created cellular boxworks and incrustations. The limonite is live, suggesting it formed via oxidation of chalcocite. Rocks like this tend to run 0.3 to 0.4% Cu with traces of Mo. Most veinlets are coated with fine-grained white sericite, and silicification is minor at best.In Teaching CollectionNoMineral(s)feldsparhematitekaolinitequartzRock Namequartz monzoniteDistrictSilver BellMineSilver BellExternal LinkMindatGeo-LocationundefinedSub-LocationundefinedDeposit TypePorphyry CopperGeo-Coords^[1]Reference MaterialACL-127: Dilbert, C., and Davis, S., 1981, Trip #10 Silver Bell-North Silver Bell Deposits, in Wilkins, J., coord., AZ Geol. Soc. And Univ. AZ 1981 Symposium on Relations of Tectonics to Ore Deposits in the southern Cordillera.

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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5-3-002: quartz monzonite - Silver Bell District - Silver Bell Mine

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5-3-002: quartz monzonite - Silver Bell District - Silver Bell Mine