Long Ledge No. 3

The Long Ledge No. 3 is a chromium mine located in Fresno county, California at an elevation of 1,060 feet.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Long Ledge No. 3
Secondary: Black Bear Mine
Secondary: Rose Lease

Commodity

Primary: Chromium
Tertiary: Platinum
Tertiary: Iridium
Tertiary: Palladium
Tertiary: Rhodium
Tertiary: Ruthenium

Location

State: California
County: Fresno
District: Watts Valley Area

Land Status

Land ownership: National Forest
Note: the land ownership field only identifies whether the area the mine is in is generally on public lands like Forest Service or BLM land, or if it is in an area that is generally private property. It does not definitively identify property status, nor does it indicate claim status or whether an area is open to prospecting. Always respect private property.

Holdings

Not available

Workings

Type: Surface/Underground

Ownership

Owner Name: C. E. Hull
Years: 1951 -

Production

Not available

Deposit

Record Type: Site
Operation Category: Producer
Operation Type: Unknown
Years of Production:
Organization:
Significant: N
Deposit Size: S

Physiography

General Physiographic Area: Pacific Mountain System
Physiographic Province: Cascade-Sierra Mountains
Physiographic Section: Sierra Nevada

Mineral Deposit Model

Model Name: Podiform chromite (minor)

Orebody

Form: DISSEMINATED, VEINLETS, STRINGERS, LENSES

Structure

Type: L
Description: Fault Offsets Ore Zone 10-15 Ft Between The Two Large Open Cuts. Ore Parallels Poorly Developed Schistosity In Serpentine

Alterations

Alteration Type: L
Alteration Text: Ultramafic Rocks Serpentinized In Small Stringers And Lenses From 1 In. To Several Ft Thick

Rocks

Name: Gabbro
Role: Associated
Age Type: Host Rock
Age Young: Pennsylvanian

Name: Gabbro
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pennsylvanian

Name: Gabbro
Role: Associated
Age Type: Associated Rock
Age Young: Pennsylvanian

Analytical Data

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

Materials

Ore: Chromite
Gangue: Serpentine
Gangue: Olivine

Comments

Comment (Deposit): RECORD W023615 HAS BEEN MERGED AND DELETED.

Comment (Geology): PERIDOTITE LIES WEST OF GABBRO MASS

Comment (Location): IN SIERRA NATIONAL FOREST ON EDGE OF PINE FLAT RESERVOIR

Comment (Workings): 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.

References

Reference (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.

Reference (Production): RYNEARSON, 1948

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

Reference (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.

California Gold

"Where to Find Gold in California" looks at the density of modern placer mining claims along with historical gold mining locations and mining district descriptions to determine areas of high gold discovery potential in California. Read more: Where to Find Gold in California.