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Long Ledge No. 3

Producer in Fresno county in California, United States with commodities Chromium, Platinum, Palladium, Iridium, Ruthenium, Rhodium
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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. Mineral occurrence model information
  10. Host and associated rocks
  11. Nearby scientific data
  12. Geologic structures
  13. Ore body information
  14. Controls for ore emplacement
  15. Economic information about the deposit and operations
  16. Mining district
  17. Land status
  18. Ownership information
  19. Reserves and resources
  20. Workings at the site
  21. Links to other databases
  22. Bibliographic references
  23. General comments
  24. Reporter information

Geologic information

Identification information

Deposit ID 10109804
MRDS ID M700413
Record type Site
Current site name Long Ledge No. 3
Alternate or previous names Black Bear Mine, Rose Lease

Geographic coordinates

Geographic coordinates: -119.28874, 36.86939 (WGS84)
Elevation 323
Location accuracy 500(meters)
Relative position ABOUT 3.5 MI NORTHEAST OF PINE FLAT DAM, Estimated Within Quarter Section, Estimated Within Quarter Section, Estimated Within Quarter Section

Site location context

Political divisions (FIPS codes)

Fresno(county)

California(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Pine Flat Dam(quadrangle 1:24,000 scale)

Fresno(quadrangle 1:100,000 scale)

Fresno(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Upper King(hydrologic unit)

Tulare-Buena Vista Lakes(hydrologic accounting unit)

Tulare-Buena Vista Lakes(hydrologic subregion)

California(hydrologic region)

Federal lands

Sierra 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 Fresno

Public Land Survey System information

Meridian Township Range Section Fraction State
Mount Diablo 012S 025E 19 S2 OF SW4 California

Comments on the location information

  • IN SIERRA NATIONAL FOREST ON EDGE OF PINE FLAT RESERVOIR

Commodities

Commodity Importance
Chromium Critical Primary
Platinum Critical Tertiary
Palladium Critical Tertiary
Iridium Critical Tertiary
Ruthenium Critical Tertiary
Rhodium Critical Tertiary

Materials information

Materials Type of material
Chromite Ore
Olivine Gangue
Serpentine Gangue

Alteration

  • (Local) Ultramafic Rocks Serpentinized In Small Stringers And Lenses From 1 In. To Several Ft Thick

Analytical data

Result 1 PGE ANALYSIS: PT=80 PPB
Result PD=<1 PPB
Result IR=60 PPB
Result RU=170 PPB
Result RH=4 PPB

Mineral occurrence model information

Model code 15
USGS model code 8a
Deposit model name Podiform chromite (minor)
Mark3 model number none

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
    Stratigraphic age (youngest) Pennsylvanian
    Stratigraphic age (youngest) Pennsylvanian
    Stratigraphic age (youngest) Pennsylvanian
  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite
    Rock unit name Kings-Kaweah Ophiolite
    Rock description Kings-Kaweah Ophiolite
  • Host or associated Associated
    Rock type Plutonic Rock > Granitoid > Granite
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Peridotite > Dunite

Nearby scientific data

(1) -119.28874, 36.86939
ListMap

Economic information

Geologic structures

Type of structure Local
Structure description Fault Offsets Ore Zone 10-15 Ft Between The Two Large Open Cuts. Ore Parallels Poorly Developed Schistosity In Serpentine

Ore body information

  • General form DISSEMINATED, VEINLETS, STRINGERS, LENSES
    Strike N80W
    Dip 60SW

Controls for ore emplacement

  • Magmatic Segregation

Comments on the geologic information

  • PERIDOTITE LIES WEST OF GABBRO MASS

Economic information about the deposit and operations

Development status Producer
Commodity type Metallic
Deposit size Small
Significant No

Mining district

District name Watts Valley Area

Land status

Ownership category National Forest

Ownership information

  • Type Owner
    Owner C. E. Hull
    First year 1951

Reserves and resources

  • Type In-situ
    Estimate year 1918
    Total resources 178000mt ore
    Commodity Subtype Grade units Group Importance Year
    Chromium Cr2O3 30 wt-pct Chromium Major 1918

Workings at the site

  • Type of workings Surface/Underground
    Length 22.86M
    Overall depth 7.62M

Comments on the workings information

  • WORKINGS CONSIST OF AN OPEN PIT (35 X 5-10 FT) FORMED AROUND COLLAR OF SHAFT, ANOTHER OPEN CUT (50 X 10-12 FT), AN ADIT, AN OPEN STOPE CONNECTING THE LARGER OPEN CUT AND ADIT, AND 2 OTHER SMALL OPEN CUTS.

Reference information

Bibliographic references

  • Deposit

    RYNEARSON, G.A., 1948, GEOLOGICAL INVESTIGATIONS OF CHROMITE IN CALIFORNIA: CALIFORNIA DIVISION OF MINES BULLETIN 134, PT. 3, CH. 3, P. 95.

  • Deposit

    CARLSON, C.A., AND OTHERS, 1985, ANALYSES FOR PLATINUM-GROUP ELEMENTS IN SAMPLES FROM PODIFORM CHROMITE DEPOSITS, CALIFORNIA AND OREGON: U.S. GEOLOGICAL SURVEY OPEN-FILE REPORT 85-442, 14 P.

  • Deposit

    LOGAN, C.A., BRAUN, L.T., AND VERNON, J.W., 1951, MINES AND MINERAL RESOURCES OF FRESNO COUNTY, CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY V. 47, NO. 3, P. 545, PL. 6.

  • Production

    RYNEARSON, 1948

General comments

Subject category Comment text
Deposit RECORD W023615 HAS BEEN MERGED AND DELETED.

Reporter information

Type Date Name Affiliation Comment
Reporter 01-JUL-80 Oster, Karel L. (Albers, John P.) U.S. Geological Survey
Updater 01-FEB-90 Peterson, Jocelyn A. 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.