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Don Pedro Mine

Past Producer in Tuolumne county in California, United States with commodities Chromium, Iron
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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. Nearby scientific data
  9. Ore body information
  10. Economic information about the deposit and operations
  11. Mining district
  12. Mineral rights holdings
  13. Land status
  14. Ownership information
  15. Workings at the site
  16. Links to other databases
  17. Bibliographic references
  18. Reporter information

Geologic information

Identification information

Deposit ID 10214146
MRDS ID W025956
MAS/MILS ID 0061090112
Record type Site
Current site name Don Pedro Mine
Alternate or previous names Booker Lease, Rosasco Mine
Related records 10111228

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -120.4207, 37.77912 (WGS84)
Elevation 274
Location accuracy 100(meters)

Site location context

Political divisions (FIPS codes)

Tuolumne(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Chinese Camp(quadrangle 1:24,000 scale)

Oakdale(quadrangle 1:100,000 scale)

San Jose(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Tuolumne(hydrologic unit)

San Joaquin(hydrologic accounting unit)

San Joaquin(hydrologic subregion)

California(hydrologic region)

Geographic areas

Country State County
United States California Tuolumne

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 002 S 014 E 10 SWNENW California

Commodities

Commodity Importance
Chromium Critical Tertiary
Iron Tertiary

Materials information

Materials Type of material
Chromite Unknown
Enstatite Unknown
Olivine Unknown
Penninite Unknown
Serpentine Unknown

Nearby scientific data

Ore Body (1) -120.4207, 37.77912
ListMap

Economic information

Ore body information

  • Strike N15W
    Dip 80E
    Thickness 25M
    Length 122M
    Width 30M
    Area 2HA
    Depth to top 0M
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 LENTICULAR
    Type of Orebody #2 SHEAR ZONE
    Shape of Orebody #2 IRREGULAR
    Shape of Orebody #3 OTHER
    Primary mode of Origin MAGMATIC DIFFER
    Primary Ore Control LITHOLOGY
    Secondary Ore Control IGNEOUS
    Degree of Wallrock Alter. INTENSE
    Type of Wallrock Alter. #1 CARBONITIZATION
    Strike And Dip N15W:80E
    Minimum Depth to Top 0
    Avg. Thick. Unconsol. Mat. 0
    Min. Thick. Unconsol. Mat. 0
    Total Surface Area (HA) 2
    Date of Last Modification 820614

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1905
Year of first production 1905

Mining district

District name Marsh Flats Area

Mineral rights holdings

Type of mineral rights Other
Type of mineral rights Fee Ownership

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Edythe R. Banta And Nina Challenor
    Interest 50
    Home office California
    Year 1976
  • Type Owner
    Owner Turlock And Modesto Irrigation District 1975
    Interest 50
    Home office California
    Year 1976
  • Type Operator
    Owner Ne Booker,R Powell,Gn Porter (Lastoperator
    Home office California
    Year 1976
    Last year 1918
  • Type Operator
    Owner Lavensaler-Speir Corp. (Lastoperator-1918
    Home office California
    Year 1976

Comments on the production information

  • TOTAL PRODUCTION (1905-1918) WAS BETWEEN 561 AND 700 METRIC TONS; AVERAGED 40% CR2O3. NO RESERVE ESTIMATE POSSIBLE (NO ORE IN PLACE) BUT TALIFERRO (1918). GUESSED THAT CONSIDERABLE AMOUNT OR ORE REMAINS. THE AVERAGE MINEABLE GRADE OF CHROMITE IS 40% AND FE IS 11%. INSUFFICIENT DATA FOR MATRIX CALCULATION ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES - DISSEMIN. E=S102 07.10, CR2O3 51.16, FEO 17.33, TOTAL FE 20.58, AL203 06.6, 4.09, CR/FE 2.19

Workings at the site

  • Type of workings Surface
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OPEN PIT
    Swell Factor .6
    Avg. Overburden Thickness 0
    Hardness of Ore M-HARD ROCKS
  • Type of workings Underground
    Length 100M
    Overall depth 12M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Status of Mining Method PROPOSED
    Mining Method OPEN STOPE
    Swell Factor .6
    Hardness of Rock HARDROCK FISSURED WITH MODERATE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. UNSUPPORTING NO FLOW
    Mine Support Chars. TIMBER W/LAGGING CONCRETE-UNREINFOR
    Number of Shafts 8
    1st Condition of Workings CAVED AT PORTAL

Reference information

Bibliographic references

  • Deposit

    BRADLEY, W.W., ET AL, 1918, CA STATE MINING BUREAU BULLETIN

  • Deposit

    76, P. 213.

  • Deposit

    CATER, F.W., JR., 1948, TUOLUMENCO, CA DIVISION OF MINES AND

  • Deposit

    GEOLOGY BULLETIN 134, PT. 3, CHAPTER 1, P. 17-18, PL. 1.

  • Deposit

    TALIFERRO, N.L., 1918, COOP WAR MINERALS INVEST., CA,

  • Deposit

    TUOLUMNE CO., #3.

Reporter information

Type Date Name Affiliation Comment
Reporter 14-JUL-1994 Unknown U.S. Bureau of Mines

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.