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Randolph Mine (Randolph claims), Bonanza Mine group (Mellgren group; Chance Mine; Mellgren Mine; Mellgren Mine), Tombstone District, Tombstone Hills, Cochise Co., Arizona, USA
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Latitude: 31°41'26"N
Longitude: 110°6'42"W
‡Ref.: The Resources of Arizona - A Manual of Reliable Information Concerning the Territory, compiled by Patrick Hamilton (1881), Scottsdale, AZ: 38.

Church, J.A. (1903) The Tombstone, Arizona, mining district: American Institute of Mining Engineers, Transactions: 33: 4.

Jones, Jr., E.L. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: Plate V.

Butler, B.S., Wilson, E.D., and Rasor, C.A. (1938b), Geology and ore deposits of the Tombstone district, Arizona, Arizona Bureau of Mines Bull. 143: 18, 20, 108, Pl. III.

Romslo, T.M. & S.F. Ravitz (1947), Arizona manganese-silver ores, US Bureau of Mines Report of Investigation 4097: 8.

Keith, Stanton B. (1973), Arizona Bureau of Mines Bull. 187, Index of Mining Properties in Cochise County, Arizona: 78 (Table 4).

U.S. Bureau of Mines file data.

Arizona Bureau of mines files.

MRDS database Dep. ID file #10027040, MRDS ID M001785; and, Dep. ID #10209592, MAS ID #0040030674.

A former small underground Ag-Cu-Pb mine located in the SE ¼ sec. 16, T.20S. R.22E, 2½ miles SW of Tombstone, on private land. Operated at times, or in part, by the Mellgren Group and the Tombstone Silver Fields Co. Operators also included W. Fowler; and Brewster & Farrington.

Mineralization is spotty silver values along an oxidized fissure vein cutting Cretaceous Bisbee Group beds.

Local structures include NE-trending granodiorite dikes in the area. One is located near the shaft.

Workings include a shallow shaft(s). A few hundred tons of ore were produced intermittently from the 1880's to 1917.

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