Tres de Mayo Mine group, Fresno Canyon, Palmetto Mining District, Patagonia Mountains, Santa Cruz County, Arizona, USAi

Regional Level Types
Tres de Mayo Mine group	- not defined -
Fresno Canyon	Canyon
Palmetto Mining District	Mining District
Patagonia Mountains	Mountain Range
Santa Cruz County	County
Arizona	State
USA	Country

‡Ref.: Schrader, F.C. (1915) Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, with contributions by J.M. Hill: U.S. Geological Survey Bulletin 582, 373 p., 3 sheets, scale 1:125,000: 290.

Moger, S.R. (1969) University of Arizona, M.S. thesis, 60 p.

Simons, F.S. (1974) Geologic map and sections of the Nogales and Lochiel quadrangles, Santa Cruz County, Arizona: U.S. Geological Survey Miscellaneous Investigations Series Map I-762, 9 p., 1 sheet, scale 1:48,000.

Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 74 (Table 4).

U.S. Bureau of Mines field notes Pb14.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10102403, MRDS ID #M000429; and, Dep. ID #10113534, MAS ID #0040230388.

A former small underground Cu-Ag-Au-Pb-Zn-Mn-Mo-V mine group located in the SW¼SW¼ sec. 3 & the N½ sec. 10, T.23S., R.15E, on the S side of Fresno Canyon, 1 mile NE of the Jarillas Mine group, about 10 miles NE of Patagonia, and 2 miles NE of Nogales International Airport, on National Forest land. There were 7 unpatented claims in 1958 (27 unpatented claims in 1923). Discovered in 1880 by A.J. Stockton and Associates. Owned/operated at times, or in part, by Stockton; Peck and Salmando ( 1910); Backman & Merritt Mines Co. (1918-1920); Monarch Mining & Milling Co. (1922); Taft Mining & Exploration Co. (1928); Melville Syndicate (1929-1930); Hunter (1923); Newcomer (1938-1941); and, Cummings (1942). Owned by Arthur Peck and Frank Otero (1975). Operated by the General Development And Mining Co. Tres De Mayo Mine); Frank Otero And Rupert Beyerle (1958).

Mineralization is lenses of argentiferous galena with minor chalcopyrite and sphalerite in a quartz, psilomelane, and gouge gangue in fissure-zone veins, oxidized to cerussite, acanthite, and rich chlorargyrite pockets. Narrow bands of Mn are found within the Tres De Mayo vein and in adjacent wall rock. The wall rock is strongly sheared and fractured Precambrian rock intruded by Jurassic granite. A major fault passes through the area and a Northeast-striking fracture zone contains weak, oxidized sulfide mineralization. Psilomelane often contains lead and silver values. Surface oxidation to 90 feet of depth. Diorite near the contact is both chloritized and epidotized. An associated rock unit is the Comoro Canyon Granite.

The deposits occur mainly in 2 veins about 300 feet apart. A 4 foot wide Mn vein also occurs on the property. The 20 foot wide fault zone that strikes N-S & dips steeply W intersects the Tres De Mayo vein about 600 feet NW of the Tres De Mayo shaft. Numerous minor fissures striking N30-65W occur between the fault and vein.

Workings include shaft operations to a depth of 165.2 meters. Workings include the 542 foot deep vertical Tres De Mayo shaft and several levels. The 4th level has a total of 420 feet of drifts and crosscuts. Worked by Mexicans prior to 1880 but mainly from 1910 through 1942, producing in total some 200 tons of ore averaging about 70 oz. Ag/T, 25% Pb and minor Cu & Au.

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Link to USGS MRDS:	10102403

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