Barter, C. F., 1978, Stratigraphy, alteration, and ore controls in the main ore zone, Twin Buttes mine, Pima County, Arizona: Arizona Geological Society Digest 11, p. 115116. (Also available at http://www.arizonageologicalsoc.org/Default.aspx?pageId=1665440 and at http://archives.arizonageologicalsoc.org/digests/AGS_DIG11_S.PDF.)Barter, C.F., and Kelly, J.L., 1982, Geology of the Twin Buttes mineral deposit, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 407432.
Einaudi, M.T., 1982, Description of skarns associated with porphyry copper plutons, southwestern North America, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 139183.
Kelley, J.L., 1976, Geology of the Twin Buttes copper deposit, Pima county, Arizona: AIME Annual Meeting, Las Vegas, February 2226, 1976, Preprint No. 7613, 23 p.
Singer, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the worldDatabase and grade and tonnage models, 2008: U.S. Geological Survey Open-File Report 2008-1155, [45] p. and digital data, accessed December 31, 2013, at http://pubs.usgs.gov/of/2008/1155/.Titley, S.R., 1982, Some features of tectonic history and ore genesis in the Pima mining district, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p. 387406.