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Big Johnny Mine (Big Johnny-Little Johnny claims; Big Johnny Little Johnny Mines), Papago District (Sierrita District), Sierrita Mts, Pima Co., Arizona, USA

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Latitude & Longitude (WGS84): 31° 55' 46'' North , 111° 17' 26'' West
Latitude & Longitude (decimal): 31.9294444444, -111.290555556
 
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: 417.

US Atomic Energy Commission Preliminary Reconnaissance Report Pima County (1952): 671.

Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral00 Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 132 (Table 4).

USGS Palo Alto Ranch Quadrangle topo map.

Arizona Bureau of Mines file data.

MRDS database Dep. ID file #10039653, MRDS ID #M050577; and, Dep. ID #10186266, MAS ID #0040190121.

A former small surface and underground Pb-Ag-Mn-Cu-Au-Mo-U mine located in South-central sec. 23, T.17S., R.10E.

Mineralization is manganiferous veins and replacement lenses containing spotty, oxidized argentiferous galena and minor sulfides with wulfenite in fractured and metamorphosed Paleozoic limestone in a NNW shear zone between the limestone and quartzite. Host rock units include the Escabrosa Limestone and the Bisbee Group. Geology is similar to the Aguinaldo Mine.

Local structures include NNW fractures, thrust faults.

Workings include shafts and pits. Worked by 'chloriders' for silver in the late 1800's and by prospectors in 1937-1938. Total production was only some 100 tons between the Big Johnny & Little Johnny Mines. Ore averaged over 20 oz. Ag/T with good lead values and minor copper.

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4 entries listed. 3 valid minerals.

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