‡Ref.: Ashley, R.P. (1974), Field Examination (Gila Monster Mine).
Arizona State Land Department Mineral Lease List (1979) – lease 3 49164.
Rocks & Minerals (1988): 63: 327.
Rocks & Minerals (1989): 64: 58.
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 225, 374.
MRDS database Dep. ID file #10039672, MRDS ID #M050626; and, Dep. ID #10283209, MAS ID #0040190634.
A former small underground Pb-Zn-Cu mine located in sec. 13, T13S, R12E, on the NW periphery of Tucson.
Mineralization is a contact metasomatic deposit hosted in the Tucson Mountains chaos unit with ore in veins and pods. Alteration is argillitic. The ore body is 2 meters wide, strikes N65E and dips 58S.
The vein seems to be sheared-looking. The western margin of the limestone block (outcrop 20-30 meter diameter), forms the hanging wall. Workings are in brecciated andesite with soft pale green argillic matrix. One zone looks like a 2 meter wide zone of irregular stringers and pods of specular hematite plus quartz, plus dark green chlorite with scarce sphalerite, Cu silicate, and galena.
Workings include 2 shafts 10 meters apart.
Field observations: This mine is now relatively inaccessible due to the encroachment of the city of Tucson and private property. The road to the mine area is similarly blocked and access is only by permission of the property owners where the public road ends and an approximate 1 mile (1.6 km) hike.
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Map Reference: 32°17'46"N , 111°7'14"W
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