Jefferson Mine (Jefferson tunnel), Trenton Gulch, Salero area, Tyndall District, Santa Rita Mts, Santa Cruz Co., Arizona, USA
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Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 209.
Drewes, H.D. (1971) Geologic map of the Mount Wrightson quadrangle, southeast of Tucson, Santa Cruz and Pima Counties, Arizona: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-614, 1 sheet, scale 1:48,000.
Drewes, H.D., 1972, Structural geology of the Santa Rita Mountains, southeast of Tucson, Arizona: U.S. Geological Survey Professional Paper 748, 35 p., scale 1:12,000, 4 sheets: 9-11.
Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 86 (Table 4).
U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology production file data.
U.S. Bureau of Mines file data-cluster #109, Jefferson Mine.
U.S. Bureau of Mines field notes, PB24.
Arizona Bureau of Mines card file Santa Cruz County.
MRDS database Dep. ID file #10046333, MRDS ID #M241270; and, Dep. ID #10234635, MAS ID #0040230239.
A former small surface and underground Pb-Ag-Zn-Cu-Au mine located in the SE¼SE¼ sec. 13, T.21S., R.14E., ½ mile NE of Salero Mountain, SE of US location monument No. 11, south side of Trenton Gulch, ¼ mile SE of the Trenton Mine, at an elevation of 4,985 feet, on private land. Produced 1922-1950. Owned/operated at times, or in part, by Curtis & Steinfeld of Tucson (circa 1915); Kruse (1923); Mr. Frank Aubrey (1927); Henderson (1928); Fulk (1936); Moreno (1939); Newman (1941); Miller (1942); Jefferson Mines, Inc. (1943). Owned by Mrs Jane Bouldin; R. R. Hansen and Associates; and Nuttal & Snyder [Snyder and Nuttles](1954). Operated by Mr. Phil Snyder (1950).
Mineralization is irregular, lensing quartz-fissure vein, about 7 feet wide, containing sulfides that are oxidized near the surface (to depths of 100 feet), along a dike cutting Laramide diorite. Lead and zinc carbonates are found in the oxidation zone. Below 100 feet galena and sphalerite are encountered. Mineralization occurs either next to the footwall or the hanging wall of the dike. The dike, which varies in width from 12 to 50 feet, is about 3000 feet long and is mineralized on the Jefferson property for a length of about 1000 feet and on the Trenton property for about the same length. Mineralized portions of the dike vary in width from 2-12 feet, and in length from 5-100 feet. The ore zone is 304.8 meters long and 15.24 meters wide, strikes S80E, and dips 85S. The mineralization accompanied or followed the intrusion of a dike. Ore control was the foot and hanging walls of the dike and quartz seams. An associated rock unit is the Josephine Canyon Diorite. Tectonic elements include the Salero Fault Block. The hanging and foot walls of the dike are composed of granite porphyry on the upper levels of the mine and diorite on the lower levels. Local features include vertical of steeply-dipping quartz veins in diorite and granite porphyry.
Workings include a 150 foot deep shaft (1881) and adit operations. The tunnel runs S.40ºE. for 110 feet. There were 2 shafts: one 200 feet deep, the other 75 feet deep; 2 major tunnels: upper tunnel at 250 feet long (ore stoped above and below the tunnel); and the lower tunnel at 275 feet long; and, 12 to 15 open cuts on the surface varying in depths from 2-8 feet. Workings total 243.84 meters in length and 60.96 meters deep. Worked from the early 1900's through 1950, producing some 6,500 tons of ore. Ore values for the period 1923-1928 averaged about 15% Pb, 5 oz. Ag/T, 2% Zn, 0.4% Cu, and minor Au.
6 entries listed. 6 valid minerals.
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