Augusta Mine

Alternate Names

Hosey, Presidential, Exposed Reef

Company

Presidential Mg. Co., Leek, Ferguson, McDonald Mg. Co., Altamit\eano & Matrecita.⁵

Mining District

Wrightson District

Location

21S 15E, NE¼ 7⁵

Mineral Products

Pb, Cu, Ag, Zn-, Au- ⁵

Geology

Lensing quartz fissure veins containing brecciated wall rock and shoot and stringer of massive, granular, and crystalline pyrite, argentiferous galena, chalcopyrite, tetrahedrite, chalcocite, argentite, and minor calcite and hematite. Some spotty sphalerite. Wall rock is Triassic monzonite intruded by Jurassic granite.⁵

Type of Operation and Production

Shaft operations. Worked in 1880’s and sporadically through 1936, producing some 450 tons of ore averaging about 15% Pb, 9% Cu, 9 oz. Ag/T and 0.4 oz. Au/T.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, F. C. Schrader, U.S. Department of Interior, 1915. Republished 2014 by Kerby Jackson.
3. Mike Bertram, 2/1/26
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 Stanton B. Keith, bulletin 1991, Arizona Geological Survey, 1975
6. WesternMiningHistory.com