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Challenge deposit, Redwood City, San Mateo Co., California, USA

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Latitude & Longitude (WGS84): 37° 27' 57'' North , 122° 15' 16'' West
Latitude & Longitude (decimal): 37.46611,-122.25472
GeoHash:G#: 9q9j4h2zf
Köppen climate type:Csb : Warm-summer Mediterranean climate


A former Hg deposit/mine located in the approximate center sec. 36, T5S, R4W, MDM, 2.7 km (1.7 miles) SW of Redwood City (center), just inside the western boundary of the city. Owned by A.F. Oddstad, Jr. First produced in 1955. MRDS database accuracy for this location is not stated. Now part of a housing development.

Mineralization is hosted in Late Jurassic-Late Cretaceous serpentinite of the Franciscan Formation. The ore body is irregular. Serpentine occurs as float. The ore is in slump rock and alluvium. Local alteration includes the silica carbonate alteration of serpentine. Local rocks include ultramafic rocks, chiefly Mesozoic, unit 3 (Coast Ranges and Western Klamath Mountains).

Workings included surface openings with an overall width of 15.24 meters. Operations terminated in 1958 so that the area could be developed into a housing area.

Production statistics: Year: 1962 (period = until 1962): estimated ^6 to 10 pounds (3,614 grams) Hg/metric ton.


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


17 valid minerals.

Rock Types Recorded

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Alphabetical List Tree Diagram

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Quaternary
0 - 2.588 Ma



ID: 3185749
Cenozoic sedimentary rocks

Age: Pleistocene (0 - 2.588 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Cretaceous - Jurassic
66 - 201.3 Ma



ID: 2580853
Franciscan Complex, Sheared rock (melange)

Age: Mesozoic (66 - 201.3 Ma)

Stratigraphic Name: Franciscan Complex

Description: Predominantly graywacke, siltstone, and shale, substantial portions of which have been sheared, but includes hard blocks of all other Franciscan rock types. Total thickness of unit is unknown, but is probably at least several tens of meters

Reference: Brabb, E.E., R.W. Graymer, D.L. Jones. Geology of the onshore part of San Mateo County, California. U.S. Geological Survey Open-File Report 98-137. [90]

Late Jurassic - Middle Jurassic
145 - 174.1 Ma



ID: 2881494
Ultramafic rocks, chiefly Mesozoic, unit 3 (Coast Ranges and Western Klamath Mountains)

Age: Jurassic (145 - 174.1 Ma)

Stratigraphic Name: Josephine Peridotite

Description: Ultramafic rocks, mostly serpentine. Minor peridotite, gabbro, and diabase. Chiefly Mesozoic unit 3

Comments: Coast Range ophiolite, Josephine ophiolite. Ultramafic rocks in Middle to Late Jurassic ophiolites of Coast Ranges and westernmost Klamath Mts.

Lithology: Major:{serpentinite}, Minor:{peridotite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Rogers, Austin Flint (1911a), Eglestonite from San Mateo County, California: American Journal of Science, 4th. Series: 32: 48-50.
Woodhouse, C.D. (1934), A new occurrence of montroydite in California: American Mineralogist: 19: 603-604.
Davis, Fenelon Francis (1955), Mines and mineral resources of San Mateo County, California: California Journal of Mines and Geology (Report 51): 51(4): 413-414.
Holmes, Jr., G.W. (1965), Mercury in California: in: U.S. Bureau of Mines Information Circular 8252.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 181, 197.
Dunning, Gail, The Challenge Mercury Deposit, Redwood City, San Mateo, California., Bay Area Mineralogists Journal Vol. 9, No. 1.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040863.

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