Two Brothers Mine

Alternate Names

None known

Company

Old Dominion Mining and Reduction Company

Mining District and Mines

Nogales District

Not mentioned in Schrader².

from anyplaceamerica.com

Location

On Mount Benedict, north of Nogales

31.39708N, 110.92707W⁴

23S,14E, E.Cen. 29⁵

Mineral Products

Au, Pb, Ag, Cu-.⁵

Shallow shafts and tunnel operations. Worked sporadically from the mid-1800s to 1915. The production would be some 100 tonnes averaging about 0.8 oz. Au/T, 4% Pb, 4 oz. Ag/T, and minor Cu⁵

Geology

Irregular shear veins containing spotty, largely oxidized, suriferous and argentiferous lead and minor copper mineralization in roughly banded quartz and brecciated Jurasic quartz monzonite wall rock. Associated lamprophyre and diorite dikes. ⁵

References

1. Mineral Appraisal of Coronado National Forest, Part 12, Santa Rita Mountains Unit, MLA11-94 (1994). SR 591-609
   http://repository.azgs.az.gov/sites/default/files/dlio/files/nid1813/usbm_mla_011-94.pdf
2. Mining in the Santa Rita and Patagonia Mountains of Arizona, U.S. Department of Interior, 1915. Republished 2014 by Kerby Jackson.
3. Mike Bertram,
4. USGS Mineral Resources Data System - using WGS84 (https://mrdata.usgs.gov/mrds/map-commodity.html#home)
5. Index of Mining Properties in Santa Cruz County by Staton B. Keith, bulletin 1991, Arizona Geological Survey, 1975