Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 257.
Simons, F.S. (1974) Geologic map and sections of the Nogales and Lochiel quadrangles, Santa Cruz County, Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-762, 9 p., 1 sheet, scale 1:48,000.
The Exposed Reef and Blue Eagle properties comprise 22 lode claims totalling 440 acres and include the following claims: Border Patrol, Lime Bank Nos. 1-5, Donna Maria, Mill Site, Reed Tunnel, Iron Bank, Blue Eagle Nos. 1-2, St. Louis, North Star, Log Cabin, Cow Boy, Powder House, Exposed Reef, Silver Tunnel, Lucky Day, Silver Star, Invincible, St. Patricks, Old Boy, Rogers, and the Red Fox Nos. 1-4.
The claims are located on a large belt of coarse rhyolite porphyry that includes nearly all of Red Mountain. The porphyry belt is profusely impregnated with crystals and grains of pyrite, chalcopyrite, and chalcocite.
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