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  3. Mineral Resource Data System (MRDS)

Little Bonanza

Past Producer in San Luis Obispo 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. Controls for ore emplacement
  13. Economic information about the deposit and operations
  14. Mining district
  15. Ownership information
  16. Production statistics
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. Reporter information

Geologic information

Identification information

Deposit ID 10040884
MRDS ID M055763
Record type Site
Current site name Little Bonanza
Alternate or previous names Alice, Modoc, Josephine, Tartaglia, George
Related records 10117038

Geographic coordinates

Geographic coordinates: -120.91709, 35.58718 (WGS84)
Elevation 610
Relative position 20 MI W OF PASO ROBLES

Site location context

Political divisions (FIPS codes)

San Luis Obispo(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Cypress Mountain(quadrangle 1:24,000 scale)

Paso Robles(quadrangle 1:100,000 scale)

San Luis Obispo(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Salinas(hydrologic unit)

Central California Coastal(hydrologic accounting unit)

Central California Coastal(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California San Luis Obispo

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 027S 010E 17 California

Comments on the location information

  • LOCATED AT CENTER OF SECTION

Commodities

Commodity Importance
Mercury Primary

Materials information

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

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
  • Host or associated Host
    Rock type Sedimentary Rock > Chemical Sediment > Chert

Nearby scientific data

(1) -120.91709, 35.58718
ListMap

Economic information

Ore body information

  • General form IRREGULAR
    Strike E
    Dip 40 N
    Plunge 45
    Plunge direction E

Controls for ore emplacement

  • Brecciation

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Medium
Significant No
Discovery year 1862
Production years 1900 - 1905, 1908, 1911 - 1917, 1919, 1930 - 1934, 1937 - 1939, 1941 - 1942

Mining district

District name Adelaide

Ownership information

  • Type Owner
    Owner Earl Merrifield And Others

Production statistics

  • Year 1962
    Period To 1962
    Material HG
    Accuracy Estimate
    Description Cp_Grade: ^5-12 Lb/Ton
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Trace Mercury Mercury 3840g/mt

Workings at the site

  • Type of workings Unknown
    Length 914.4M
    Overall depth 79.25M

Comments on the workings information

  • IDLE SINCE 1940, SOME WORKINGS CAVED

Comments on development

  • FIRST DEPOSIT DISCOVERED IN COUNTY

Reference information

Bibliographic references

  • Deposit

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

  • Deposit

    ECKEL, E. B., YATES, R. G., AND GRANGER, A. E., 1940, QUICKSILVER DEPOSITS IN SAN LUIS OBISPO COUNTY AND SOUTHWESTERN MONTEREY COUNTY, CALIFORNIA: USGS BULL. 922 - R, P. 515 - 580

  • Deposit

    BAILEY, E. H., USGS, PERSONAL FILES

  • Deposit

    FRANKE, H.A., 1935, MINES AND MINERAL RESOURCES OF SAN LUIS OBISPO COUNTY, CALIF.: CJMG, V. 31, P. 434-455

  • Deposit

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

  • Deposit

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

  • 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.