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

Mendocino Mining & Milling Co. Inc.

Producer in Mendocino county in California, United States with commodities Gold, Platinum, Mercury
Map
XML
JSON
KML
B
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. Mineral occurrence model information
  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. Land status
  16. Ownership information
  17. Workings at the site
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10038056
MRDS ID M045326
Record type Site
Current site name Mendocino Mining & Milling Co. Inc.
Alternate or previous names Hopland
Related records 10285652

Geographic coordinates

Geographic coordinates: -123.06775, 38.96376 (WGS84)
Elevation 244
Relative position 2 MI SOUTHEAST OF OLD HOPLAND ON DOOLEY CREEK AND IN HILLS EAST OF CREEK

Site location context

Political divisions (FIPS codes)

Mendocino(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Hopland(quadrangle 1:24,000 scale)

Point Arena(quadrangle 1:100,000 scale)

Santa Rosa(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Russian(hydrologic unit)

Northern California Coastal(hydrologic accounting unit)

Klamath-Northern California Coastal(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Mendocino

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 013N 011W 21,28 California

Comments on the location information

  • LOCATION GIVEN IS FOR DOOLEY CREEK WHERE IT CROSSES THE SECTION LINE. DEPOSIT IS PRIMARILY IN HILLS TO EAST OF CREEK AND SOUTH OF MCDOWELL CREEK

Commodities

Commodity Importance
Gold Primary
Platinum Critical Secondary
Mercury Tertiary

Comments on the commodity information

  • PLATINUM HAS BEEN REPORTED BUT NOT VERIFIED

Materials information

Materials Type of material
Cinnabar Ore
Gold Ore

Mineral occurrence model information

Model code 119
USGS model code 39a
Deposit model name Placer Au-PGE
Mark3 model number 54

Host and associated rocks

  • Host or associated Host
    Rock type Unconsolidated Deposit > Gravel
    Rock unit name Franciscan Formation
    Rock description Franciscan Formation
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -123.06775, 38.96376
ListMap

Economic information

Ore body information

  • General form STREAM SEDIMENT DEPOSITS
    Thickness 0.91M

Controls for ore emplacement

  • Stream Hydraulics

Comments on the geologic information

  • THE GRAVEL INCLUDES BOULDERS AND PEBBLES OF SCHISTS, GREENSTONES, QUARTZ, SERPENTINE, AND JASPER DERIVED FROM THE FRANCISCAN FORMATION, SERPENTINE, AND INTRUSIVE ROCKS

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No
Production years 1883, 1924

Mining district

District name Red Mountain District

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Lloyd C. Ashley
    First year 1924

Comments on the production information

  • WORKED BY HOWELL IN 1883, WORKED BY LLOYD ASHLEY IN 1924. A PLANT ESTABLISHED IN 1920 FAILED TO RECOVER GOLD AND PLATINUM IN PAYING QUANTITIES AND IT WAS SHUT DOWN AFTER TWO DAYS OPERATION AND WAS DISMANTLED. IN 1924, LLOYD ASHLEY OF ALAMEDA WORKED DEPOSIT ON A SMALL SCALE AND A SMALL PRODUCTION OF PLATINUM WAS REPORTED.

Workings at the site

  • Type of workings Surface/Underground
    Area 103.603HA

Comments on the workings information

  • ROCKERS AND SLUICES, SHAFTS

Reference information

Bibliographic references

  • Deposit

    O'BRIEN, J.C., 1953, MINES AND MINERAL RESOURCES OF MENDOCINO COUNTY, CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY, V. 49, NO. 4, P. 367.

  • Deposit

    LAIZURE, C.MCK., 1924, MENDOCINO COUNTY: CALIFORNIA STATE MINING BUREAU, 20TH REPORT OF THE STATE MINERALOGIST, P. 87.

  • Deposit

    LOGAN, C.A., 1919, PLATINUM AND ALLIED METALS IN CALIFORNIA: CALIFORNIA STATE MINING BUREAU BULLETIN 85, P. 44.

General comments

Subject category Comment text
Deposit GOLD AND PLATINUM IN A LAYER OF GRAVEL 1.5-3 FT THICK OVERLYING A SANDSTONE GRAVEL. DESCRIPTION MAKES IT SOUND LIKE OLDER GRAVELS FROM ABANDONED CHANNELS OF THE RUSSIAN RIVER
Deposit SEE ALSO: MRDS M045325.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-NOV-1974 Blair, Will N. U.S. Geological Survey
Updater 01-JAN-1989 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.