Jackson Mine, Jackson Mine group (McCleary group; Old Baldy Copper Mine; Rosa Mine; Hickory; Decatur), Jackson Canyon, Old Baldy Mining District, Pima County, Arizona, USAi

Regional Level Types
Jackson Mine	Mine
Jackson Mine group (McCleary group; Old Baldy Copper Mine; Rosa Mine; Hickory; Decatur)	- not defined -
Jackson Canyon	Canyon
Old Baldy Mining District	Mining District
Pima 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: 171-172.

Drewes, H.D. (1971) Geologic map of the Sahuarita quadrangle, southeast of Tucson, Pima County, Arizona: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-613, 1 sheet, scale 1:48,000.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 12 (Table 1).

MRDS database Dep. ID file #10039499, MRDS ID #M050172.

A former small surface and underground Cu-Ag-Au mine located in the SE¼ sec. 24, T.19S., R.14E. (Sahuarita 15 minute topo map), in the northern part of the district, 6.5 miles W of Greaterville and 1 mile S of McCleary Camp, On Jackson Canyon, at an elevation of about 4,700 feet. Discovered 1910. Owned by W.B. McCleary, and since 1910 has been developed by the Old Hickory Copper Co.

The mineralization is contained in a lens of dark diorite, which is intrusive into the gray granite that is exposed nearby on the west. The diorite seems also to be intrusive into the rhyolite on the east. The diorite is a dark medium-grained, moderately porphyritic rock composed chiefly of oligoclase-andesine and dark green hornblende, and it contains considerable magnetite. The host rock units are the Madera Canyon Granodiorite and the Elephant Head Quartz Monzonite. The Madera Canyon Granodiorite is intrusive into the Elephant Head Quartz Monzonite and rhyolite of the middle member of the Mount Wrightson Frmation.

The deposit is a compound fissure vein or stockwork which has a reported extent of nearly a mile (1,609.3 meters long) and 7.62 meters wide. It is about 25 feet wide at the shaft and dips 72º NNW at the upper part of the shaft.

The gangue is largely magnetite with some quartz, and the ore is principally copper ore carrying small quantities of gold and silver. The croppings, which are not prominent, consist mainly of iron cap with weathered bands, bodies, stringers, and veins of limonite and stained magnetite, which are best developed on the hanging wall side. Some copper carbonate of copper occurs at the shaft, just below the surface. At a depth of 20 feet a body of chalcopyrite and pyrite with a little quartz appears, at an 60 feet is enlarges to a 3½ foot lens or oreshoot of good-grade chalcopyrite ore which pitches 45ºENE.

Additional lenses of similar ore were struck at greater depth. The tunnel is also driven on an 8 inch (20 cm) vein of magnetite contained in the diorite. In the adjoining bed of the canyon at about 20 feet above the tunnel is a 10 inch (25 cm) vein of magnetite that strikes N.80ºW.

Local structures include thrust and normal faulting, fracture zones, homoclinal. Regional trends include tilting and broad open folds in the south and extensive faulting in the north.

Workings feature a tunnel (4,570 feet of altitude) and a 100 foot deep shaft (4,775 feet of altitude).

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Link to USGS MRDS:	10039499

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