Harshaw Gulch

In Harshaw Gulch, a short narrow tributary of Boston Gulch with steep bedrock sides, the pay streak, which in places was rich, was confined to the bottom of the gulch, about 4 feet wide².

Mining District and Mines

Greaterville District

Location

?⁵

Mineral Products⁶

Ag, Au

Type of Operation and Production

Boston Gulch (including tributary Harshaw Gulch): gold-bearing gravels from the head of the gulches to about ½ mile south of Kentucky Gulch. Gravel channels increased in width from 4 to 50 ft. and in depth from 2 to 16 ft. as the distance from the head of the gulch increased¹.

Major operations from 1875 to early 1900s and small and sporadic since then. Estimated production of some 30,000 oz. Au or more with about 6,000 oz. Ag⁶.

Geology⁶

Course flake and nugget gold with minor combined silver and some attached galena in medium sized gravel among recent and older buried channels and terraces close to the mountain front.

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).