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Milton Claim

Past Producer in Sierra 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. Reserves and resources
  19. Links to other databases
  20. Bibliographic references
  21. General comments
  22. Reporter information

Geologic information

Identification information

Deposit ID 10043627
MRDS ID M100435
Record type Site
Current site name Milton Claim
Alternate or previous names Redmayne and Mcgonigal Prospect

Geographic coordinates

Geographic coordinates: -120.61714, 39.52989 (WGS84)
Elevation 2079
Relative position APPROX. 20 MILES EAST OF DOWNIEVILLE, CA. BY ROAD.

Site location context

Political divisions (FIPS codes)

Sierra(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Haypress Valley(quadrangle 1:24,000 scale)

Portola(quadrangle 1:100,000 scale)

Chico(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper Yuba(hydrologic unit)

Lower Sacramento(hydrologic accounting unit)

Sacramento(hydrologic subregion)

California(hydrologic region)

Federal lands

Tahoe National Forest(National Forest)

National Forest FS(Type of land area)

FS(Federal land areas administered by FS)

Geographic areas

Country State County
United States California Sierra

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 019N 012E 10 S2 OF SE OF NW California

Comments on the location information

  • LOCATED NEAR THE HEADWATERS OF THE MIDDLEFORK OF THE YUBA RIVER.

Commodities

Commodity Importance
Chromium Critical Primary

Comments on the commodity information

  • ANALYSIS MADE BY THE SMITH EMERY COMPANY, 1941

Materials information

Materials Type of material
Chromite Ore
Uvarovite Gangue

Alteration

  • (Local) Moderate To Complete Serpentinization Of Host Rock.

Analytical data

Result ORE CONTAINS 40.6% CR2O3, CR TO FE RATIO 2.36 TO

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Intermediate Volcanic Rock > Andesite
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Permian
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite
    Rock unit name Calaveras
    Rock description Calaveras

Nearby scientific data

(1) -120.61714, 39.52989
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Two Dominant Directions Of Shearing Found In The Deposit. One Trending N70-75w, The Other Trending N10-20e

Ore body information

  • General form LENSE
    Strike N50-55W
    Dip 60-70 N
    Plunge 15-20 SE
    Length 5M
    Width 1M

Comments on the geologic information

  • THE DEPOSIT OCCURS IN A LINEAR MASS OF ULTRAMAFIC ROCK EXPOSED IN THE NORTHERN SIERRA NEVADA MOUNTAINS.

Economic information about the deposit and operations

Development status Past Producer
Commodity type Metallic
Significant No
Discovery year 1918
Discoverer R.C. Zaring
Year of first production 1941
Year of last production 1941

Mining district

District name Sierra City Area

Land status

Ownership category Private

Ownership information

  • Type Operator
    Owner Zaring, R. C.
  • Type Owner
    Owner Hartley, Mrs. Jean
    Home office 5020 Winding Way, Sacramento, Ca. 95841

Production statistics

  • Year 1941
    Material ORE
    Accuracy Accurate
    Description Ap_Grade: ^Lump Ore Averaging 40.60% Cr2o3
    Importance Item Commodity Group Amount recovered Grade Recovery percentage
    Major Cr2O3 Chromium Chromium 41wt-pct

Reserves and resources

  • Type In-situ
    Estimate year 1975
    Total resources 223000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 30 wt-pct Chromium Major 1975

Comments on the reserve resource information

  • STINSON, 1975
  • TOTAL RESERVES.

Comments on the workings information

  • WORKINGS CONSISTED OF AN UPPER CUT, 65 FT. LONG, 10-15 FT WIDE AND A SMALLER OPEN CUT WITH AN ADIT DRIVEN IN THE WEST WALL, 45-50 FT LOWER AND 100 FT EAST OF THE UPPER CUT.

Reference information

Bibliographic references

  • Deposit

    RYNEARSON, G.A., 1950, CDMG BULL 134, PART 3, CHAPT. 5, P. 257, 258.

  • Deposit

    AVERILL, C.V., 1942, CALIF. JOURNAL OF MINES AND GEOL., V. 38, NO. 1, P. 16.

  • Deposit

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

  • Production

    AVERILL, 1942.

  • Reserve-Resource

    STINSON, 1975

General comments

Subject category Comment text
Deposit ORE OCCURES AS DISCONTINUOUS LENSES OF THE ABOVE DIMENSIONS ENCLOSED IN LARGER, LENS-SHAPED DUNITE BODIES.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-SEP-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.