Snyder Mine

The Snyder and Conglomerate mines may have combined. Only one line of shafts and adits was found.

Alternate Names

Conglomerate, Anderson, A. W. A., Aurum, Silver Moon, Reese, Colossa, Sonoita.

Mining District and Mines

Greaterville District

Historical: The Anderson prospect, also know as the Conglomerate mine, is 2½ miles south-southwest of Greaterville, near the top of the limestone ridge on the south side of Fish Canyon at an elevation of 5,640 feet. The owner, J. E. Anderson, reports having shipped from it 19 tons of galena that assayed 68% of lead and 54 ounces of silver to the ton. It is opened principally by a 50 foot shaft on a near vertical northwest-southeast brecciated and silicified contact between the granite and the limestone. The ore minerals are principally galena and cerusite, with a little chalcopyrite and horn silver, occurring in pockets and small boulders scattered through the zone. Oxidation extends to the bottom of the shaft.²

3D model

60 foot level Adit

Adit

Adit (all of the above set of diagrams from reference #1)

Shaft, view 1

Shaft, view 2
There are a number of shafts running up the hillside in a line.
See the above sample map SR 241 to 248.

There are also a nubmer of adits around the main shaft area

Adit #1

Adit #2

Adit #3

Adit and Foundations

Tunnel

Water Tank

Possible loading area

USBM: 7 shafts: 12, 50, 55, 65 feet deep; flooded at over 100 feet deep; and caved at 20 and 3 feet deep. 5 adits: 25, 30, 140, 250, and 330 feet long. Also many small prospect pits, trenches, and cuts.¹

Historical: Shaft, 340 feet deep, with connecting 200 feet crosscut adit, and 1,000 feet of drifts, stopes, and winzes; plus 3 other adits, 140, 140, and 250 feet long (5).¹

Location

31.73233N, 110.76208W⁴

S ctl., sec. 36
T. 19 S., R. 15 E.¹

Mineral Products

Historical: Worked sporadically producing some 1,000 tons of ore averaging about 10% Pb, 8 oz/t Ag, minor Cu and Au (1). Assays of 4 samples taken in underground workings: Ag, 0.4 - 24.1 oz/t; Au, 0.02 - 0.22 oz/t; Pb 8.5 - 50.0%. Assays of 5 samples taken from surface prospects: Ag, 0.3 - 0.4 oz/t (4 samples), 5.7 oz/t (1 sample); Au, trace - 0.06 oz/t; Pb trace - 0.3% (4 samples), 2.1% (1 sample); (1)¹

USBM: Ag, <1 - 73 ppm; Au, 12 - 3,170 ppb; Cu, 14 - 2,227 ppm; Mn, 260 - 10,000 ppm; Pb, 40 - >10,000 ppm; Sr 7 - 360 ppm; Zn 50 - 40,000 ppm.¹

Geology

Primary mineralized zone is NW-striking, near vertical fault zone along contact between granite and limestone. Conjugate (?) faults striking NE have also been mineralized. The primary fault zone is heavily brecciated and silicified, and contains quartz and calcite veinlets with spotty galena. Cerussite and Angelsite have also been reported (3, 5). ¹

Type of Operation and Production

Historical: Early 1900s - 1955. Worked sporadically producing some 1,000 tons of ore averaging about 10% Pb, 8 oz/t Ag, minor Cu and Au (1). ¹

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 - possibly using NAD72 (https://mrdata.usgs.gov/mrds/map-commodity.html#home)