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Cowell Silver Sand Company, Clayton, Contra Costa Co., California, USAi
Regional Level Types
Cowell Silver Sand Company- not defined -
Clayton- not defined -
Contra Costa Co.County
CaliforniaState
USACountry

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Latitude & Longitude (WGS84):
37° 56' 42'' North , 121° 59' 30'' West
Latitude & Longitude (decimal):
Nearest Settlements:
PlacePopulationDistance
North Gate679 (2017)4.4km
Clayton11,867 (2017)4.9km
Concord128,667 (2017)5.0km
Waldon5,364 (2011)5.9km
Pleasant Hill34,810 (2017)6.0km


A silica occurrence/pit located in the SE¼NW¼SE¼ sec. 8, T1N, R1W, MDM, 5.0 km (3.1 miles) W of Clayton (3 miles SE of Concord). Operated by Henry Cowell Lime and Cement Company. MRDS database stated accuracy for this location is 100 meters. Several hundred tons of sand per month were being removed. In 1958, the pit was being worked by the Silver Sand Company and Charles Laws. Material produced was about 45 cubic yards per day, and was being used as fill sand for asbestos shingles. Most of the sand was subsequently used as fill material under the concrete foundation slabs of homes.

NOTE: USGS MRDS database file #10187440, that is lacking an literature references, states that this locality is a Ag deposit. This is quite apparently an egregious error based on the name of one of the operators (Silver Sand Company).

Mineralization is a sand deposit. Local rocks include Eocene marine rocks.

Workings include surface openings comprised of a pit.

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References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Davis, Fenelon Francis & J.W. Vernon (1951), Mines and mineral resources of Contra Costa County, California: California Journal of Mines and Geology (Report 47): 47(4): 581.
California Journal of Mines and Geology (1958) (Report 54): 54(4): 552-553, 580 & 554-555, 583.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10109199 & 10187440.
U.S. Bureau of Mines Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060130042.

USGS MRDS Record:10109199

Other Regions, Features and Areas containg this locality

North America
North America PlateTectonic Plate
USA

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