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Mockingbird Mine (Talc & Lacy claim), Colorado, Colorado District, Mother Lode Belt, Mariposa Co., California, USA

Gold
Mockingbird Mine, Colorado, Colorado District, Mother Lode Belt, Mariposa Co., California, USA

Photo: 2002 John H. Betts

Latitude: 37°33'33"N
Longitude: 119°58'48"W

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A former lode Au mine located in sec. 27, T4S, R18E, MDM, 1.0 km (3,100 feet) W of the Colorado School, along a small tributary of Saxon Creek, on private land. Named the Talc & Lacy claim (pre-1900). Discovered < 1890. Produced 1890's to 1920. Patented claim(s) amounted to 20 acres. Operator David W. And Maxie S. Dukes. MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is a vein deposit hosted in slate and greenstone. The ore body strikes N40-45W and dips 90. Gold occurs at the border of a nearly vertical, chloritic, altered greenstone dike where gently-dipping quartz stringers cutting the dike cut the slate wall rocks. Altered dike averages 3 feet thick. The quartz stringers are a fraction of an inch to several inches thick. The deposit produced specimens of wiry & arborescent gold. Local rocks include Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains) and/or Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

Workings include surface and underground openings with an overall depth of 30.48 meters comprised of 1 shaft with drifts and a tunnel several hundred feet long.

Production data are found in: Bowen, O.E., Jr. & C.H. Gray, Jr. (1957).

No other production record found.

Mineral List

Arsenopyrite
Calcite
'Chlorite Group'

'Clay'
Galena
Gold

Pyrite
Pyrrhotite
Quartz

'Wad'

10 entries listed. 7 valid minerals.

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References

Castello, W.O. (1921), Mariposa County: California Mining Bureau. Report 17: 126.

Laizure, Clyde McK (1928), Mariposa, Madera Counties: California Journal of Mines and Geology, California Mining Bureau (Report 24): 24: 101.

Bowen, O.E., Jr. & C.H. Gray, Jr. (1957), Mines and mineral deposits of Mariposa County, California: California Journal of Mines and Geology: 53(1&2): 133, 286.

Bowen, W.E. and Evans (1966).

Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 24 (map 2-13).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10114883 & 10031128.

Mineralogical Record (2007): 38: 212.

Cook, R. & T. Gressman (2008) The Mockingbird Gold Mine, Mariposa County, California. Rocks & Minerals 83(5): 392-401.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060430462.

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Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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