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Commodore Mine (Golden Gate Mine), San Andreas, San Andreas District, Mother Lode Belt, Calaveras Co., California, USA

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A former lode Au mine located in the SW¼ sec. 7, T4N, R12E, MDM, 2.2 km (7,300 feet/1.3 miles) NW of San Andreas at Carson Hill. Operated during the periods 1899 to October 1900, and July 1933 to September, 1934. MRDS database stated accuracy for this location is 500 meters.

Mineralization is hosted in quartz diorite. The Commodore East vein was reported as a quartz diorite intrusive. A section from W to E gives: amphibolite schist, ankerite, a quartz vein, a wide body of ankerite, and serpentine, a mineralized quartz diorite intrusion which is the Commodore vein, serpentine and diabase. A 4 foot thick zone of crushed material from which rhombic crystals of dolomite contained visible gold particles, is on the hanging wall side of the quartz diorite. Local rocks include Paleozoic metavolcanic rocks, unit 4 (Western Sierra Nevada Foothills) and/or Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

Workings include underground openings comprised of a 300 foot deep shaft with several levels (80, 200 & 300 feet), drifts and crosscuts, which include a 450 foot adit, 80, 200 & 300 . The working shaft is vertical for the first 80 feet, thereafter the remainder is at an incline of 75 degrees.

Production data are found in: Clark, Wm. B. & P.A. Lydon (1962).

Production data: $7 (period values) per ton ore encountered to the N at 300 foot level. No production record found.

Analytical data results: Ore averaged $4 (period values) per ton Au (mill test - 1900).

Mineral List

6 entries listed. 4 valid minerals.

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Tucker, W. Burling (1916), Amador, Calaveras, Tuolumne Counties: California Mining Bureau. Report 14: 1-172; […(abstract): Geol. Zentralbl., Band 27: 396 (1922)]: 82.

Knopf, Adolf (1929), The Mother Lode system of California: USGS Professional Paper 157, 88 pp.; […(abstract): Engineering & Mining Journal: 128: 24 (1929); […Geol. Zentralbl., Band 41: 364-367 (1930)]: 38.

Logan, Clarence August (1934), Mother Lode Gold Belt of California: California Division Mines Bulletin 108, 221 pp.: 137-138.

Logan, Clarence August and Franke, H. (1936), Mines and Mineral Resources of Calaveras Co.: California Division of Mines, California Journal of Mines & Geology, California Division of Mines: 32(3): 243, 301.

California Journal of Mines and Geology (1955) (Report 51): 51: 145, Pl. B. (reerence uncertain - cryptic in MRDS).

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]: 51, 145, Pl. B.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 76, 256.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10102657 & 10211508.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060090439.

Mineral and/or Locality  
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