Romaggi & Costa Mine (Gold Hill Mine; Bruner Mine; Osborn Mine; Evening Star Mine; Spring Gulch Construction; Bald Hill Mine; St Lawrence Mine), Angels Camp District, Mother Lode Belt, Calaveras Co., California, USA
Latitude: 38°4'26"N
Longitude: 120°34'27"W
A former lode Au mine. Claims include: Apex; Dewett; New Discovery; Clark Consolidated claim; Placer Osborne Truax, and the Osborne claim. NOTE: Alternate coordinates provided: 38°02'46"N, 120°31'37"W.
Mineralization is hosted in amphibolite, greenschist, phyllite and greenstone.
Production data are found in: Clark (1962).
References
Kerr, M.B. (1900), Register of Mines and Minerals, County of Calaveras, California, California Mines Bureau.
Logan, Clarence August and Franke, H. (1936), Mines and Mineral Resources of Calaveras Co.: California Division of Mines, California Journal of Mines & Geology: 32(3): 242, 299, 306, 317, 319.
Clark, Wm. B. & P.A. Lydon (1962), Mines and mineral resources of Calaveras County, California: California Division of Mines & Geology County Report 2; [… Geological Society of America Proceedings, 1933: 312-313, 1934]: 34-35, 43, 56, 141, 149, 154, 177 and Pl. B.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 15 (map 2-5).
Mineral List
3 entries listed. 2 valid minerals.
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