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Ace of Spades

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. 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. Mineral rights holdings
  16. Land status
  17. Ownership information
  18. Links to other databases
  19. Bibliographic references
  20. General comments
  21. Reporter information

Geologic information

Identification information

Deposit ID 10077884
MRDS ID W025954
MAS/MILS ID 0061090108
Record type Site
Current site name Ace of Spades
Alternate or previous names Redfox claim (1941)

Geographic coordinates

Point of reference Ore Body
Geographic coordinates: -120.37878, 37.80131 (WGS84)
Elevation 381

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 001S 014E 36 SESE California

Comments on the location information

  • A SHORT DISTANCE ABOVE THE BOTTOM OF RESERVOIR GULCH AND NE OF IT.

Commodities

Commodity Importance
Chromium Critical Primary
Iron Tertiary

Materials information

Materials Type of material
Chromite Ore

Alteration

  • (Local) Complete serpentinization of host rock
  • (Local) Carbonitization

Analytical data

Result USBM grab sample of ore assayed 21.8% Cr2O

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

Ore Body (1) -120.37878, 37.80131
ListMap

Economic information

Geologic structures

Type of structure Local
Structure name Highly sheared host rock

Ore body information

  • General form Lense
    Length 7.62M
    Width 1.52M
    Depth to top 0M

Comments on the geologic information

  • THE MINE IS LOCATED IN THE EASTERNMOST AND LARGEST OF TWO SERPENTINE BELTS THAT TREND NW ACROSS THE COUNTY. THE BELT IS EXPOSED OVER AN AREA 30 KM BY 6 KM AND CONTAINS MOST OF THE COUNTY'S CR DEPOSITS.

Economic information about the deposit and operations

Operation type Surface-Underground
Development status Producer
Commodity type Metallic
Significant No
Discovery year 1917
Discoverer J. Ruolf, H.E. Egan, H. Heniker

Mining district

District name Marsh Flats Area

Mineral rights holdings

Type of mineral rights Located Claim

Land status

Ownership category Private

Ownership information

  • Type Owner
    Owner Johnson, Lee B.
    Year 1941
  • Type Owner
    Owner J. Ruolf, H.E. Egan, H. Heniker
    Year 1976

Comments on the workings information

  • WORKINGS CONSISTED OF THREE SMALL PITS AND A 15 FT SHAFT (1945)

Comments on development

  • 35-40 TONS OF ORE MINED IN 1918 ON THE DUMPS.

Reference information

Bibliographic references

  • Deposit

    Cater, F.W., Jr., 1948, California Division of Mines BULL 134 PT. 3 CHAP. 1 P. 15 and PL. 1

General comments

Subject category Comment text
Deposit Discovery Year: WWI
General Doug Causey - Incorporated data from 2 duplicate records and deleted them (DEP_ID 10238809, 10043695)
Deposit DEPOSIT CONSISTS OF A SERIES OF SMALL LENSES STRIKING FROM N 50 E TO N 25 W AND DIPPING STEEPLY TO THE EAST.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-1993 Unknown U.S. Geological Survey
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.

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.