Gordon, E.R., 1922, Geology of the Twin Buttes mining district: Tucson, University of Arizona, M.S. thesis, 12 p. Authors Gordon, E.R. Publication Date 1922 Citation Tucson, University of Arizona, M.S. thesis, 12 p. State AZ Province BR County PM Placenames Sierrita Mts. Keywords Mineral District Areal Mineralization Porphyry Copper More Keywords Mineral District, Areal, Mineralization, Porphyry Copper, AzGeoBib RefNum 3707