Specimen Number4-8-021Alternate NumberR-1CommentsPinal schist, sericitized, oxidized, and leached. During hypogene phase this unit was sericitized and pyrrhotitized, occurring as it does within the phyllic zone. Subsequent supergene alteration has destroyed the pyrite and heavily stained the unit with hematite and minor jarosite. Veinlet facings show minute boxworks of maroon to purple live limonite, an oxidation product of chalcocite. Grade likely less than 0.01% Cu.In Teaching CollectionNoMineral(s)hematitequartzsericiteRock NameschistDistrictMineral CreekMineRayExternal LinkMindatGeo-LocationundefinedSub-LocationundefinedDeposit TypePorphyry CopperGeo-Coords[1] Reference MaterialACL-115: Hoelscher, S.A., 1977, Structural Geology of the Ray mine, Recent Developments, AZ Conference AIME, Mining Geology Division Meeting, Ray Mine, AZ, April 16, 1977, 18 p.
ACL-116: Cornwall, H.R., and Banks, N.G., 1977, Igneous Rocks and Copper Mineralization in the Ray Porphyry Copper District, Arizona, U.S.G.S. Open-file report 77-255, 1977, 10 p.
ACL-117: Gambell, N.A., 1977, Geology and Mineralization of the Ray Silicate Orebody, AZ Conference AIME, Mining Geology Division Meeting, Ray Mine, AZ, April 16, 1977, 15 p.
ACL-118: Gambell, N.A., 1977, A Review of the Ray Orebody, AZ Conference AIME, Mining Geology Division Meeting, Ray Mine, AZ, April 16, 1977, 19 p.
ACL-121: Gambell, N.A., 1976, Geology and Mineralization of the Ray silicate orebody, 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. 35.
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.
4-8-021: schist - Mineral Creek District - Ray Mine. Franklin College Collections, accessed 15/06/2026, https://digitalcollections.franklin.uga.edu/nodes/view/31482