Mine Descriptions

Nogales Mining District

aka Gold Hill District. Mount Benedict area between Santa Cruz river and Nogales Wash. This district is in Santa Cruz county.


Mine/PlacerMRDS41914 mapSchrader2 Pima6 Santa Cruz5
Columbia Mine group        1

Dura Mine group

        2
Gold Hill mine         3
Reagan Mine group
        4
Two Brothers mine         5
Uncle Sam Mine group         6

Location

23S, 14E6

Mineral Products

Au, Pb, Ag, Cu, W (Mo)6

Geology

1. Irregular fissure veins, with spotty, often banded, pyrite, cerussite, galena, and minor copper carbonates and sulfides, in Jurassic quartz monzonite that has been strongly sliced by sheeted fracturing and intruded by splite, granite, porphyry, diorite, lamprophyre, and diabase dykes.

2.Irregular and lensing, comb structured quartz-wulfamite veins with minor scheelite associated wth dikes cutting Jurassic quartz monzonite.

3. Spotty gold placer deposits reported in Guebabi Canyon (NE, T23S, R14E) and on east slope of Mt. Benedict.6

Types of operation and production

Mostly shallow shaft, tunnel and open cut operations. Worked as early as the 1850's and sporadically up to 1967. Estimated and recorded production would amount to some 1,100 tons of ore containing about 1,019 oz. of gold, 95 tons of lead, 14,200 oz. of silver and 9 tons of copper. About 1,500 pounds of 50% WO3 concentrates may have been shipped. Output from gold placers unknown but probably relatively small.6.


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 191, Arizona Geological Survey, 1975
  6. Index of Mining Properties in Pima County by Staton B. Keith, bulletin 189, Arizona Geological Survey, 1974