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  3. Mineral Resource Data System (MRDS)

Oat Hill Mine

Past Producer in Napa 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. Geologic structures
  12. Ore body information
  13. Controls for ore emplacement
  14. Economic information about the deposit and operations
  15. Mining district
  16. Ownership information
  17. Production statistics
  18. Workings at the site
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10040797
MRDS ID M055670
Record type Site
Current site name Oat Hill Mine
Alternate or previous names Oat Hill, Napa Consolidated

Geographic coordinates

Point of reference Main Entrance
Geographic coordinates: -122.51859, 38.67852 (WGS84)
Elevation 561
Location accuracy 10(meters)
Relative position 9 MI SE OF MIDDLETOWN. North of James Creek and south of Table Mountain. Adit labeled Oat Hill Mine on Detert Reservoir 24k topo.

Site location context

Political divisions (FIPS codes)

Napa(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Detert Reservoir(quadrangle 1:24,000 scale)

Healdsburg(quadrangle 1:100,000 scale)

Santa Rosa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Bureau of Land Management(Bureau of Land Management CA)

Bureau of Land Management CA BLM(Type of land area)

BLM(Federal land areas administered by BLM)

Geographic areas

Country State County
United States California Napa

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 010N 006W 33 NW4 NE4 California

Commodities

Commodity Importance
Mercury Primary

Materials information

Materials Type of material
Cinnabar Ore
Calcite Gangue
Pyrite Gangue
Quartz Gangue

Alteration

  • (Local) Kaolinization Of Sediments

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Mafic Volcanic Rock > Basalt
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Holocene
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock
    Rock unit name Franciscan Complex
    Rock description Franciscan Complex

Nearby scientific data

Main Entrance (1) -122.51859, 38.67852
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Local Fractures , Brecciation Of Sediments
Type of structure Regional
Structure description Mayacmas Anticline Trending Nw

Ore body information

  • Strike NW
    Dip NE
    Thickness 12.19M

Controls for ore emplacement

  • Local Faults Trending Nw And Ne

Comments on the geologic information

  • FAR REMOVED FROM SERPENTINE, AN UNUSUAL OCCURRENCE. BASALT FLOW PRESENT.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant Yes
Discovery year 1872
Year of first production 1876

Comments on exploration

  • 1943 DIREXPL WITH USBM - SIGNIFICANT TONNAGE OF LOW GRADE OR

Mining district

District name East Mayacmas

Ownership information

  • Type Operator
    Owner Kritikos, William
    First year 1970
  • Type Owner
    Owner Norman B. Livermore And Sons

Production statistics

  • Year 1960
    Period To 1960
    Material HG
    Accuracy Estimate
    Description Cp_Grade: ^10-15 Lb/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Mercury Mercury 5647g/mt

Comments on the production information

  • HIGH GRADE ORE EXHAUSTED AROUND 1903. USBM DATA.

Workings at the site

  • Type of workings Underground
    Length 32186M
    Overall depth 266.7M

Comments on the workings information

  • 3RD LARGEST MERCURY MINE IN THE US. WORKINGS LARGELY INACCESSIBLE

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    BAILEY, E. H., USGS, PERSONAL FILES

  • Deposit

    YATES, R. G. AND HILPERT, L. S., 1949, QUICKSILVER DEPOSITS OF THE EASTERN MAYACMAS DISTRICT, LAKE AND NAPA COUNTIES, CALIFORNIA: CALIF. JOUR. OF MINES AND GEOLOGY, V. 42, no. 3, p. 231-286, pl. 29.

  • Deposit

    BRADLEY, W.W., 1918, QUICKSILVER RESOURCES OF CALIFORNIA: CJMG BULL. 78, 389 P.

  • Deposit

    DAVIS, F.F., 1948, MINES AND MINERAL RESOURCES OF NAPA COUNTY, CALIF.: CJMG, V. 44, P. 176-183

  • Deposit

    JOHNSON, F.T. AND RICKER, S., 1949, INVESTIGATION OF THE OAT HILL MERCURY MINE, NAPA COUNTY, CALIF.: USBM RI 4542

  • Deposit

    RANSOME, A.L. AND KELLOGG, J.L., 1939, QUICKSILVER RESOURCES OF CALIFORNIA: CJMG, V. 35, P. 353-486

General comments

Subject category Comment text
General Note the distinction between this record for Oat Hill Mine and the other record, 10261509 (MAS 00608550127), which is the plant record.

Reporter information

Type Date Name Affiliation Comment
Reporter 1976-07-01 Peterson, Jocelyn A. U.S. Geological Survey
Editor 2010-11-09 Wilson, Anna B. U.S. Geological Survey minor revisions.

Beyond USGS

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

External references

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.