3R Mine

Mining District and Mines

Palmetto District

Schrader report²:

USBM:

Location

31.4744, -110.76330⁵

Mineral Products⁵

Primary: Copper
Primary: Silver
Secondary: Gold
Secondary: Lead
Secondary: Zinc
Secondary: Molybdenum.

Ownership⁶

Owner Name: Richardson; Amster; Three-R Mg And Mllg Co; Bird;
Three-R Mines Inc; Border Mines Inc; Colossal Mines

Type of Operation and Production⁶

Tunnel and shaft operations. Located in the late 1800's but mined mainly from 1908 through 1956, producing some 130,000 tons of ore averaging about 4% Cu with minor Ag, Pb, Zn, and Au.

Geology⁶

Large, steeply dipping, lensing orebody of disseminated cupriferous pyrite with minor chalcopyrite, bornite, and minor lead and zinc, along a fault zone intersected by numerous fractures. Zone is strongly oxidized and supergene enriched to high grade chalcopyrite and some covellite. Wall rock is a shattered and altered Jurassic granite which contains disseminated pyrite and sparse copper mineralization in quartz-sericite veinlets around the orebody. Alunite masses occur in the fault zone.

References

1. Mineral Appraisal of Coronado National Forest, Part 12, Santa Rita Mountains Unit, MLA11-94 (1994). SR 591-609
   https://data.azgs.arizona.edu/api/v1/collections/BMRI-1552428987530-264/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. mindat.org
4. USGS Mineral Resources Data System - possibly using NAD72 (https://mrdata.usgs.gov/mrds/map-commodity.html#home)
5. https://westernmininghistory.com/mine-detail/10162214/
6. Index of Mining Properties in Santa Cruz county, Arizona; Stanton B. Keith, Arizona Geological Survey, Bulletin 191 (1975).