Keystone Mine (Keystone claim group; Last Chance Mine; Madelein Patented claim; Cleveland Patented claim; Evening Star Patented claim; Alaska Patented claim), Big Bug District, Bradshaw Mts (Bradshaw Range), Yavapai Co., Arizona, USA
Latitude: 34°3'3"N
Longitude: 112°34'37"W
‡Ref.: Stevens, P. (1909) The Copper Handbook, Vol. IX: 844.
Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Rept. 92-10: 17 (Table 1).
Yale Peabody GNIS database (NOTE: this database is derived from USGS 1:24,000 topographic map data).
USGS Morgan Butte Quadrangle map.
Arizona Department of Mineral Resources Rattler claims file.
Arizona Department of Mineral Resources Southwest Minerals Corp. file.
Arizona Department of Mineral Resources Last Chance Mine file.
U.S. Bureau of Land Management Mining District Sheet 256.
A former surface and underground Cu-Pb-Ag-Au mine and claims group located in the N½ sec. 9, T.8N., R.3W. (Morgan Butte 7.5 minute topo map). Claims also extend into the N½N½S½ of sec. 9, and the S½ of sec. 4.
Mineralization includes secondary copper minerals.
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