Gladstone Mine group (Gladstone prospect; Gladstone-Proto group; Proto Mine group), Providencia Canyon, Patagonia Mining District, Patagonia Mountains, Santa Cruz County, Arizona, USAi

Regional Level Types
Gladstone Mine group (Gladstone prospect; Gladstone-Proto group; Proto Mine group)	- not defined -
Providencia Canyon	Canyon
Patagonia Mining District	Mining District
Patagonia Mountains	Mountain Range
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: 316.

Tenney, J.B. (1927-1929) History of Mining in Arizona, Special Collection, University of Arizona Library & Arizona Bureau of Mines Library: 313.

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: 80 (Table 4).

U.S. Bureau of Mines - Arizona Bureau of Geology and Mineral Technology production file data, Gladstone-Proto Mine group.

U.S. Bureau of Mines file data-cluster #22, Gladtone Mine group.

Lenon, Robert (1962) Lenon's map of Santa Cruz County.

U.S. Bureau of Mines Coronado National Forest Study.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10048331, MRDS ID #M899912; and, Dep. ID #10186473, MAS ID #0040230198.

A former small underground Cu-Ag-Au-Pb-Zn mine group located on a group of 8 unpatented claims in west-central sec. 30, T.23S., R.16E. (protracted), on the north side of Providencia Canyon, 4.0 miles NW of Washington Camp, 1.0 mile W of the Four Metals Mine, less than ¼ mile SW of the Proto Mine, about ½ mile NE of the Marché prospect, 6 miles E of Nogales International Airport, at an elevation of about 4,700 feet, on National Forest land. Group of 3 prospects located on USGS map. Discovered in 1888 by Antone Proto and Gladstone. Produced 1916-1951. Owned at times, or in part, by the Smith and Fulton (1926-1930); Raymond and Sullivan; Holland and Driscoll; the Independent Mining & Milling Co.; Mr. Hugo Miller; Michels; Proto Brothers; Bostwick; Fulton; Sullivan; Raymond & Bostwick; W.W. Todd; W.W. Todd and J.N. Moon; W.W. Todd and Bostwick, and, Mr. R.C. Blabon. Owned by Mr. J. W. Forsythe (1966). Operated by the Hanna Mining Co. (1966). The Proto and Gladstone properties were merged in 1930, forming a total of 10 unpatented claims.

Mineralization is ore in irregular vein-like bodies of chalcopyrite and oxidized copper minerals, with spotty and minor galena and sphalerite, along fault or shear zones in Laramide granodiorite. The average vein width ranges from 1-18 inches; 3 continuous ore bodies are also located on the property; 2 of the 3 ore bodies are 160 feet deep, 110 feet wide, and average 20 inches thick of 12% Cu. The Gladstone and Proto Mine groups cover the central 6000 feet of the 5-mile long fissure system, with known extent from the Buena Vista group on the south to the Morning Glory Mine on the north.

Ore control was N-S-trending quartz vein with several subsidiary veins in granodiorite. Ore shoots form lenticular shoots within the vein. Ore concentration was oxidation near surface. Minerlaization accompanied or followed intrusion of porphyritic granodiorite. Alteration was strong potassic alteration. The granodiorite is highly shattered, sheeted, and crushed.

Spotty pyrometasomatic base metal mineralization occurred along a contact of a narrow, irregular band of Pennsylvanian-Permian Naco Limestone and Tertiary granodiorite on the Arizona claim.

Tectonic elements include the Guajolote Fault Block; NW-trending, inferred Guajolote Fault lies to the east of the deposits with downthrow to the east.

Workings include tunnel and shaft operations. 1 tunnel driven into the mountain, about 300 feet long, one winze near the end of the tunnel, 100 feet deep. Mined sporadically from the early 1900's through 1951, producing some 2,000 tons of ore averaging about 8% Cu, 3 oz. Ag/T, 0.1 oz. Au/T and minor lead. Production data included in those for the Gladstone-Proto Mine group.

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Link to USGS MRDS:	10048331

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