Alteration

Peterson, J.A., ed., 1990, Preliminary mineral resource assessment of the Tucson and Nogales 1o by 2o quadrangles, Arizona: U.S. Geological Survey Open-File Report 90-0276, 134 p., 24 sheets, scale 1:250,000.

Hedlund, D.C., 1990, Geology and mineral deposits of the Steeple Rock and Duncan mining districts, Grant and Hidalgo Counties, New Mexico, and Greenlee County, Arizona: U.S. Geological Survey Open-File Report 90-0239, 27 p.

Gray, Floyd, Jachens, R.C., Miller, R.J., Turner, R.L., Knepper, D.H., Jr., Pitkin, J.A., Keith, W.J., Mariano, John, Jones, S.L., and Korzeb, S.L., 1990, Mineral resources of the Warm Springs Wilderness Study Area, Mohave County, Arizona: U.S. Geological Survey Open-File Report 90-0520, 37 p.

Conway, C.M., Hassemer, J.R., Knepper, D.H., Jr., Pitkin, J.A., Jachens, R.C., and Chatman, M.L., 1990, Mineral resources of the Wabayuma Peak Wilderness Study Area, Mohave County, Arizona: U.S. Geological Survey Open-File Report 90-0518, 73 p.

Eppinger, R.G., Peterson, J.A., Blank, H.R., Jr., Livo, K.E., Knepper, D.H., Jr., Pitkin, J.A., Spencer, J.E., Reynolds, S.J., Grubensky, M.J., Kreidler, T.J., and Scott, D.C., 1990, Mineral resources of the Gibralter Mountain and Planet Peak Wilderness Study Areas, La Paz County, Arizona: U.S. Geological Survey Open-File Report 90-0512, 36 p.

Gray, Floyd, Tosdal, R.M., Peterson, J.A., Cox, D.P., Miller, R.J., Klein, D.P., Theobald, P.K., Haxel, G.B., Grubensky, Michael, Raines, Gary, Barton, H.N., Singer, D.A., and Eppinger, Robert, 1992, The Conterminous United States Mineral Assessment Program: Background information to accompany folio of geologic, geochemical, geophysical, and mineral resource maps of the Ajo and Lukeville 1o by 2o quadrangles, Arizona: U.S. Geological Survey Circular 1082, 27 p.

DeWitt, Ed, Thorson, J.P., and Smith, R.C., 1991, Geology and ore deposits of the Oatman district, northwestern Arizona, in Epithermal gold deposits - Part II, Chapter I, in Shawe, D.R., and Ashley, R.P., eds., Geology and resources of gold in the United States: U.S. Geological Survey Bulletin 1857-I, p. I1-I28.

DeWitt, Ed, and Waegli, J., 1989, Gold in the United Verde massive sulfide deposit, Jerome, Arizona, in Gold Deposits in metamorphic rocks - Part I, Chapter D, in Shawe, D.R., and Ashley, R.P., eds., Geology and resources of gold in the United States: U.S. Geological Survey Bulletin 1857-D, p. D1-D26.

Force, E.R., and Cox, L.J., 1992, Structural context of mid-Tertiary mineralization in the Mammoth and San Manuel districts, southeastern Arizona, Chapter C, in Mineral resource studies along the Sierrita-Mogollon transect, Arizona-New Mexico: U.S. Geological Survey Bulletin 2042-C, p. C1-C28, 1 sheet, scale 1:24,000.

Eppinger, R.G., Peterson, J.A., Blank, H.R., Jr., Livo, K.E., Knepper, D.H., Jr., Pitkin, J.A., Spencer, J.E., Reynolds, S.J., Grubensky, M.J., Kreidler, T.J., and Scott, D.C., 1990, Mineral resources of the Gibralter Mountain and Planet Peak Wilderness Study Areas, La Paz County, Arizona, Chapter B, in Mineral resources of Wilderness Study Areas: Havasu region, Arizona: U.S. Geological Survey Bulletin 1704-B, p. B1-B32.