1. Mineral Resources
  2. Online Spatial Data
  3. Mineral Resource Data System (MRDS)

Challenge

Past Producer in San Mateo county in California, United States with commodity Mercury
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Public Land Survey System information
  6. Commodities
  7. Materials information
  8. Alteration
  9. Host and associated rocks
  10. Nearby scientific data
  11. Ore body information
  12. Economic information about the deposit and operations
  13. Mining district
  14. Ownership information
  15. Production statistics
  16. Workings at the site
  17. Links to other databases
  18. Bibliographic references
  19. Reporter information

Geologic information

Identification information

Deposit ID 10040863
MRDS ID M055738
Record type Site
Current site name Challenge
Alternate or previous names Farm Hill No. 2, Redwood City

Geographic coordinates

Geographic coordinates: -122.25048, 37.44574 (WGS84)
Relative position 2 MI SW OF REDWOOD CITY

Site location context

Political divisions (FIPS codes)

San Mateo(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Woodside(quadrangle 1:24,000 scale)

Palo Alto(quadrangle 1:100,000 scale)

San Francisco(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

San Francisco Bay(hydrologic unit)

San Francisco Bay(hydrologic accounting unit)

San Francisco Bay(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California San Mateo

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 005S 004W 36 California

Comments on the location information

  • LOCATED AT APPROX. CENTER OF SECTION

Commodities

Commodity Importance
Mercury Primary

Materials information

Materials Type of material
Cinnabar Ore
Mercury Ore
Metacinnabar Ore

Alteration

  • (Local) Silica Carbonate Alteration Of Serpentine

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Serpentinite
    Rock unit name Franciscan Complex
    Rock description Franciscan Complex
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Jurassic

Nearby scientific data

(1) -122.25048, 37.44574
ListMap

Economic information

Ore body information

  • General form IRREGULAR

Comments on the geologic information

  • SERPENTINE OCCURS AS FLOAT ; GEOL.DESC: ORE IN SLUMP ROCK AND ALLUVIUM

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Year of first production 1955

Mining district

District name Emerald Lake

Ownership information

  • Type Owner
    Owner Oddstad, Jr., A. F.

Production statistics

  • Year 1962
    Period To 1962
    Material HG
    Accuracy Estimate
    Description Cp_Grade: ^6-10 Lb/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Mercury Mercury 3614g/mt

Comments on the production information

  • NOW PART OF A HOUSING DEVELOPMENT

Workings at the site

  • Type of workings Surface
    Overall width 15.24M

Comments on the workings information

  • OPERATIONS TERMINATED IN 1958 SO AREA COULD BE MADE INTO A HOUSING DEVELOPMENT

Reference information

Bibliographic references

  • Deposit

    HOLMES, G. W., JR., 1965, MERCURY IN CALIFORNIA: IN USBM IC 8252

  • Deposit

    DAVIS, F.F., 1955, MINES AND MINERAL RESOURCES OF SAN MATEO COUNTY, CALIF.: CJMG, V. 51, P. 413-414

  • Production

    USBM DATA

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1976 Peterson, Jocelyn A. U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative California resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.