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Deep Lead Placer Mine, Stockton Hill, Mokelumne Hill, Mokelumne Hill District, East Belt, Calaveras Co., California, USA

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A former placer drift Au occurrence/mine located in the NE¼ sec. 13, T5N, R11E, MDM, 1.6 km (1.0 mile) S of Stockton Hill (coordinates of record) and 1.9 km (1.2 miles) S of Mokelumne Hill (town), along Chili Gulch and highway 49. Property was 90 acres. Operated in the 1880's. MRDS database stated accuracy for this location is 100 meters.

Mineralization is a placer Au deposit located on the Chili Gulch Bklue Lead paleochannel. The channel trends S and is 40 to 60 feet wide. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).

Workings include underground openings comprised of a 380 foot inclined tunnel, 2,600 feet of drifts along the channel, and 800 feet of crosscuts. A shaft from 90 to 100 feet deep would be required to reopen the mine.

About 20 acres of this ground remained unworked in 1946, and was expected to yield about an ounce of Au per cubic yard for a 6 foot cut on bedrock.

Cemented gravel averaged $1.00 (period values) per carload.

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1 entry listed. 1 valid mineral.

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References

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 (Report 32): 32(3): 358, Pl. 7.

Averill, C.V. (1946), Placer mining for gold in California: California State Division of Mines and Geology Bulletin 135, 336 p.: 252.

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]: 195.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109140 & 10162953.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060090286.

 
Mineral and/or Locality  
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