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Mackey Mine

Past Producer in Tuolumne county in California, United States with commodity Chromium
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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. Economic information about the deposit and operations
  14. Mining district
  15. Land status
  16. Ownership information
  17. Production statistics
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10043703
MRDS ID M100607
Record type Site
Current site name Mackey Mine

Geographic coordinates

Geographic coordinates: -120.43989, 37.92881 (WGS84)
Elevation 396
Relative position APPROX. 7 MILES SW OF SONORA, CA.

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 001N 014E 21 California

Comments on the location information

  • THE QUARRY TO THE NORTH OF WOODS CREEK OCCUPIES THE FORMER SITE OF MACKEY MINE.

Commodities

Commodity Importance
Chromium Critical Primary

Materials information

Materials Type of material
Chromite Ore
Asbestos Gangue
Talc Gangue
Uvarovite Gangue

Alteration

  • (Local) Serpentinization Of Saxonite

Analytical data

Result ORE AVERAGED 32-44% CR2O3

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Harzburgite
    Rock unit name Mariposa
    Rock description Mariposa
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic
    Stratigraphic age (youngest) Late Jurassic

Nearby scientific data

(1) -120.43989, 37.92881
ListMap

Economic information

Geologic structures

Type of structure Regional
Structure description Located In The Melones Fault Zone
Type of structure Local
Structure description Intense Shearing Of Most Rocks.

Ore body information

  • General form POD
    Thickness 4.27M
    Length 12.19M
    Width 4.27M

Comments on the geologic information

  • THE MINE OCCURS IN THE NORTHERN PART OF THE EASTERNMOST OF TWO SERPENTINE BELTS THAT TREND NW-SE ACROSS THE COUNTY. THE BELT IS EXPOSED OVER AN AREA OF 3KM BY 1.5KM.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Deposit size Small
Significant No
Discovery year 1865
Year of first production 1865
Year of last production 1918

Mining district

District name Jamestown Area

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner W. A. Fitzgerald
  • Type Owner
    Owner Gradella, John
    Home office Route 3, Box 32, Sonora, Ca. 95370

Production statistics

  • Year 1918
    Period 1917-1918
    Material ORE
    Accuracy Estimate
    Description Cp_Grade: ^32-40% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 36wt-pct

Comments on the workings information

  • WORKINGS CONSISTED OF 4 SMALL PITS, A CAVED DRIFT AND A 215 FT LONG TUNNEL, NOW CAVED (1918).

Comments on development

  • DEPOSIT PROBABLY MINED OUT

Reference information

Bibliographic references

  • Deposit

    STINSON, M.C., 1975, CDMG MINERAL PROPERTY REPORT, UNPUBLISHED

  • Deposit

    CATER, F.W. JR., 1948, CDMG BULL 134, PART 3, CHAPT. 1, P. 14.

  • Production

    CATER, 1948, CDMG BULL 134, PART 3, CHAPT. 1, P. 14.

General comments

Subject category Comment text
Deposit Discovery Year: 1860'S
Deposit ONE ORE BODY MINED HAD ABOVE DIMENSIONS.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-1982 Oster, Karel L. (Albers, John P.) U.S. Geological Survey

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.