Mackey Mine

Past Producer in Tuolumne county in California, United States with commodities Chromium, Iron
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. General comments
  19. Reporter information

Geologic information

Identification information

Deposit ID 10238618
MRDS ID W025971
MAS/MILS ID 0061090185
Record type Site
Current site name Mackey Mine
Related records 10077897

Geographic coordinates

Point of reference Trench
Geographic coordinates: -120.4399, 37.92882 (WGS84)
Elevation 396
Location accuracy 10(meters)

Site location context

Political divisions (FIPS codes)

Tuolumne(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Sonora(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 001 N 014 E 21 NWSWNE California

Commodities

Commodity Importance
Chromium Critical Tertiary
Iron Tertiary

Materials information

Materials Type of material
Antigorite Unknown
Asbestos Unknown
Chromite Unknown
Olivine Unknown
Pyroxene Unknown

Nearby scientific data

Trench (1) -120.4399, 37.92882

Economic information

Ore body information

  • Area 1HA
    Depth to top 0M
    Field Value
    Type of Orebody #1 DISSEMINATED
    Shape of Orebody #1 LENTICULAR
    Shape of Orebody #2 IRREGULAR
    Shape of Orebody #3 TABULAR
    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
    Minimum Depth to Top 0
    Total Surface Area (HA) 1
    Date of Last Modification 820614

Economic information about the deposit and operations

Operation type Underground
Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1860
Year of first production 1908

Mining district

District name Jamestown Area

Mineral rights holdings

Type of mineral rights Fee Ownership

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Gradella, John
    Home office California
    Year 1976
  • Type Operator
    Owner W. A. Fitzgerald-Last Operator,1918
    Home office California
    Year 1976

Workings at the site

  • Type of workings Underground
    Length 70M
    Field Value
    MAS Development Schedule # 1
    Mining Record # 1
    Mining Method GOPHERING (COYOTING) 10-29
    Hardness of Rock HARDROCK FISSURED WITH EXCESSIVE WATER
    Rock Characteristics MULTIPLE SYSTEMS OF WEAKNESS PLANES
    Rock Support Chars. SUPPORTING MAY BACK SLAB
    Mine Support Chars. POST, HEADBOARD, CAPS, ROOF BOLTS
    Number of Shafts 1
    Length of Inclines (m) 0
    Avg. Length of Adits (m) 67
    Number of Adits 1
    1st Condition of Workings NO MINE ENTRY

Reference information

Bibliographic references

  • Deposit

    C.D.M AND G BULL 134,PT.3,SIERRA NEVADA CHAP 1,P.14,1948

  • Deposit

    COOPERATIVE WAR MINERALS INVEST IN CAL.TUOLUMNE CO.#25,UNPU

  • Deposit

    18 CALIFORNIA STATE MINING BUR BULL NO.76,PP.213-214,BRADL

General comments

Subject category Comment text
Deposit LITTLE IF ANY ORE RESERVE-CITED FROM 701 ORIGINAL MACKEY MINE NOW SITE OF ASBESTOS QUARRY,CLOSED 1975 THE AVERAGE MINEABLE GRADE OF OREOF CHROMITE IS 38.0 PERCENT IS 13.0 PERCENT. INSUFFICIENT DATA FOR MATRIX CALCULATION. ANALYSIS BY CDMG IN 1976 GAVE FOLLOWING PERCENTAGES-MASSIVE 2 08.83,CR2O3 32.89,FEO 08.18,TOTAL FE 11.58,AL203 20.78,MGO CR/FE 2.50.

Reporter information

Type Date Name Affiliation Comment
Reporter 27-FEB-1984 Stinson U.S. Bureau of Mines

Beyond USGS

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

External references

Authoritative California resources

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