Latitude: 33°5'33"N
Longitude: 109°55'30"W
A group of manganese claims with underground workings located in secs. 7 & 18, T4S, R24E, 4½ miles NE of Fort Thomas, at 3,800 feet of altitude on the western slopes of the Gila Mountains, on BLM-administered land. Discovered by Louis Voelckel in 1914.
The manganese deposit consists of narrow and irregular veins that traverse sheared andesite in a northeasterly direction and narrow seams that cement andesite breccia. The veins are short; the longest one can be traced only 30 feet (9.14 meters), and it splits into branches which dip at low angles.
The veins are composed mainly of calcite, with which the manganese oxides are associated generally as concentric crusts of psilomelane and short prismatic crystals of manganite. The manganese oxides were probably derived from the decomposition of the brown calcite.
Workings include a 30 foot (9.14 meters) long tunnel and achieve a depth of 6.1 meters. The deposit proved to be too lean for any commercial development beyond the exploratory adit. The manganese veins were absent beyond the portal area.
Assays data: 18-20% Mn, 6% Fe, 6% SiO2.
References
Jones, E.L., Jr. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: 129-130.
USGS Fort Thomas Quadrangle map.
MRDS database Dep. ID #10026903, MRDS ID #M000922; and Dep. ID #10234617, MAS ID #0040090356.
Mineral List
3 entries listed. 2 valid minerals.
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