Magma mill area, Magma Mine (Magma Superior Mine; Irene claim; Hub claim; Pomeroy; Superior Division; Silver Queen; Monarch claim; Magma Copper Mine; Broken Hill; Apex), Superior, Pioneer District, Pinal Mts, Pinal Co., Arizona, USA
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Mineralisation is an outcrop that occurs in a fault or shear zone in massive gray limestone, which strikes N50E and dips 45NE. The deposit is silicified material stained and impregnated with manganese and iron oxides. It is exposed for 250 feet and is from 1 to 4 feet wide.
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Jones, E.L., Jr. & F.L. Ransome (1920), Deposits of manganese ore in Arizona, USGS Bull. 710-D: 162-163.