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Olivette and Annette Mines (Olivette Mine; Olive Mine; New Olivette Mine; Corda Brothers group; Corda group), Pima District (Olive District; Mineral Hill District; Twin Buttes District), Sierrita Mts, Pima Co., Arizona, USA

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‡Ref.: Ransome, F.L. (1922) Ore deposits of the Sierrita Mountains, Pima County, Arizona, in Contributions to Economic Geology (Short Papers and Preliminary Reports), 1921 - Part I.--Metals and Nonmetals except Fuels: U.S. Geological Survey Bulletin 725J: 423-424.

Mayuga, M.N. (1942) The Geology and Ore Deposits of the Helmet Peak Area, Pima County, Arizona, PhD thesis, University of Arizona.

Wilson, E.D., et al (1950), Arizona zinc and lead deposits, part I, Arizona Bureau of Mines Bull. 156: 48.

Waller, H.E., Jr. (1960) The geology of the Paymaster and Olivette mining areas, Pima County, Arizona: Tucson, University of Arizona, M.S. thesis, 48 p.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 136 (Table 4).

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 382.

USGS Twin Buttes Quadrangle topo map.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039582, MRDS ID #M050370; and, Dep. ID #10109608, MRDS ID #M050371; and, Dep. ID #10234712, MAS ID #0040190347.

A former small underground Ag-Pb-Zn-Cu-Au mine located in west-central sec. 11, T.17S., R.12E., near Olive Camp, about ½ mile South of San Xavier and 4¾ miles NNW of Twin Buttes. Owned/operated at times, or in part, by the Olive Camp Mining Co.; C.M. Taylor; and, J.P. Anderson.

Mineralization is a shallow-seated fissure deposit of argentiferous sulfides and sulfosalts, oxidized near the surface with rich silver chlorides, in narrow, lensing, brecciated, quartz-gouge filled, intersecting fissure veins cutting Cretaceous sedimentary beds in the San Xavier thrust block. Pyrite is found disseminated through the quartz monzonite porphyry where it is silicified and altered. High angle reverse and normal faults are found in the San Xavier Thrust Sheet paralleling its margins. The ore body is 914.4 meters long, 1.52 meters wide.

The prevailing rock in this area is light-colored Cretaceous arkose. Granite crops out as a small mass about 300 feet W of the Olivette shaft and probably underlies the present surface at no great depth.

The principal Olivette vein strikes N.80ºE. and dips 45ºNW. Near the Olivette shaft it is intersected by the Annette vein which strikes about N.8ºW. and dips 40ºNE. These veins for the most part are rather obscure at the surface. They consist of breccia about 3 to 5 feet wide between well-defined walls. The breccia contains streaks of quartz and ore minerals, and the ore shoots ranged from a few inches to 2 or more feet in width. Pyrite is found disseminated through the quartz monzonite porphyry where it is silicified and altered.

The Olivette and Annette claims were located in 1886. They were actively worked during 1887 and productive until 1893. In 1913 the Tucson Mining Co. built a concentrator of 100 tons daily capacity at the Olive Mine but nothing is known about its operation.

Workings developing the Olivette vein include two main inclined shafts about 75 feet apart, reported to be 210 feet deep and connected o the 200 level. The deepest work is reported to be at 300 feet. There are several vertical shafts of unknown depth. Total estimated and reported production, mainly in the late 1800's and early 1900's by 'chloriders', has been some 10,000 tons of ore averaging about 10 oz. Ag/T, 5% Pb, 1% Zn and minor Cu & Au. Total production from the property is reported to have been about $750,000 in silver. Some of the ore is reported to have contained from 100 to 300 ounces of silver per ton and more than 20% Pb.

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