Mansfield Mine group (Mansfield No. 1 and 2), Mansfield Gulch (Mansfield Canyon), Temporal Gulch, Wrightson Mining District, Santa Cruz County, Arizona, USAi

Regional Level Types
Mansfield Mine group (Mansfield No. 1 and 2)	- not defined -
Mansfield Gulch (Mansfield Canyon)	Gulch
Temporal Gulch	Gulch
Wrightson Mining District	Mining District
Santa Cruz County	County
Arizona	State
USA	Country

‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 226-229.

Weed, W.H. (1918) The Mines Handbook, Vol. XIII: 500 & 502.

Tenney, J.B. (1927-1929) History of Mining in Arizona, Special Collection, University of Arizona Library & Arizona Bureau of Mines Library: 317-318.

Rohrbacker, R.T. (1964) Geology of the Temporal Gulch-Mansfield Canyon area, Santa Cruz County, Arizona: Tucson, University of Arizona, M.S. thesis, 81 p.: 69.

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: 14-15.

Keith, Stanton B. (1975), Arizona Bureau of Mines Bull. 191, Index of Mining Properties in Santa Cruz County Arizona: 90, 11 (Table 4).

U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology file data.

U.S. Bureau of Land Management Mining District Sheet 687, 12.

U.S. Bureau of Mines field notes, CU38.

Arizona Bureau of Mines card file Santa Cruz County.

MRDS database Dep. ID file #10046337, MRDS ID #M241330; and, Dep ID #10283443, MAS ID #0040230275.

A former small underground Pb-Ag-Cu-Zn-Au-(Mn) mine group located on about 40 claims, of which 25 are patented, in the SE¼ sec. 9, The N½NE¼ sec. 16, the S½ sec. 10, and the N½NW¼ sec. 15, T.21S., R.15E., near the center of the district, on Temporal Gulch 3½ miles north of the Gringo Mine and about 6 miles NNW of Patagonia, on land of mixed status. Situated in lower Mansfield Canyon; at the intersection of Mansfield Canyon and Temporal Gulch. Discovered in 1879 by Jack Mansfield and Con Ryan. Produced 1881-1951. The property ultimately extends through a distance of more than 3 miles of Mansfield Canyon and Temporal Gulch. Owned/operated at times, or in part, by Mansfield & Ryan; the Gunsight Mining Co. (1883-1884); A.B. Richmond (1903-1906); Powers (circa 1890); Mansfield Mining & Smelting Co., Kansas City, MO (1906-1926); Pierce (1926); Southern Arizona Mining Co. (1926); Laycock (1934); F.P. O'Neill; Ruby Copper Co.; and the Consolidated Southern Arizona Mining Co. Operated by Mr. Bradsher (1951).

Group patented claims: Hobo; HC Bruner; Mansfield #1; New Era #2; Hornet; and Rupert. Unpatented claims: Skidoo #23; South Side; Sulphide; Timberline; Trinidad; New Era; AC Sweet; Black Cap; Chalcocite #2; North & South; Old Nick; RE Bruner; Richmond; RM Bruner; Contention; Lost Horse; and Hillside.

Mineralization is a cluster of roughly parallel quartz-fissure veins containing sulfides and sulfosalts in a quartz-calcite & barite and manganese gangue. The wall rocks are strongly altered Triassic dacitic and latitic flows and Cretaceous andesite breccia intruded by Laramide quartz latite dikes, stocks, sills, and breccia. Associated rock units include the Mt. Wrightson Formation and the Temporal Formation. Ore concentration was epigenetic mineralization of low-grade pyrite quartz veins. Chalcopyrite and pyrite occur in fine-grained, massive form.

The country rock containing the deposits is the medium- to fine-grained quartz monzonite described as occurring at the Carrie Nation Mine. It is composed principally of oligoclase-andesine, orthoclase, hornblende, biotite, and quartz. The quartz monzonite is intruded by rhyolite, which also, like the andesite, overlies and caps it in the surrounding hills. The rhyolite is tuffaceous and contains fragments of a coarse altered granitoid rock.

Local structures include the dominant monzonite which dips 35E. Rhyolite is traversed by a coarse sheeting which dips 60W. The quartz monzonite is intruded and overlain by rhyolite. Tectonic elements include the Mt. Wrightson Fault Block.

Workings include drifts, tunnels and shafts aggregating over 4,000 feet (1219.2 meters) of work. Worked intermittently from 1879 through 1951. The group produced some 370 tons of ore averaging about 19% Pb, 22 oz. Ag/T, 2% Cu, and 0.1 oz. Au/T.

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Link to USGS MRDS:	10046337

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