Silver Hill Mine

AKA: Gold Coin

Mining District and Mines

Cerro Colorado District

USBM:

Location

20S 10E E Central 17, 31.6900, -111.3380W⁷

Mineral Products⁷

Ag, Au, Pb, Cu, Zn (Hg).

Ownership⁷

Owner Name: Cotton & Flynn, Lowell, MacFarlane

Type of Operation and Production⁷

Shallow shaft operation. Worked sporadically from 1800’s to 1930’s, producing an estimated of 50 tons of ore averaging about 80 oz. Ag/T, 5% Pb, 4% Cu. and 0.1 oz. Au/T.

Geology⁷

Irregular, lensing, oxidized, quartz fissure veins with spotty argentiferous base metal sulfides in stock of Laramide dioritic intrusive and bordering andesite porphyry. Minor tetrahedrite and cinnabar.
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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).
7. Index of Mining Properties in Pima county, Arizona; Stanton B. Keith, Arizona Geological Survey, Bulletin 189 (1974).