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Mockingbird Mine (Talc & Lacy claim), Colorado area, Whitlock District, Bagby-Mariposa-Mount Bullion-Whitlock District, Mother Lode Belt, Mariposa Co., California, USA

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Latitude & Longitude (WGS84): 37° 33' 33'' North , 119° 58' 48'' West
Latitude & Longitude (decimal): 37.5591666667, -119.98

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

7 valid minerals.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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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