Mine detail: Long Ledge No. 3

Previously called 'Black Bear MineRose Lease'

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Location

Lat / long:

36.86939, -119.28874

Resource(M)

Primary:	Chromium
Tertiary:	Platinum, Ruthenium, Rhodium, Palladium, Iridium
Ore:	Chromite
Gangue:	Olivine, Serpentine
Orebody form:	DISSEMINATED, VEINLETS, STRINGERS, LENSES

Production

Operation type:	Unknown
Production size:	Small
Development status:	Producer

Geology

Host type:	Dunite
Associated rock:	Kings-Kaweah Ophiolite
Associated type:	Gabbro,Peridotite,Granite
Structure:	Fault Offsets Ore Zone 10-15 Ft Between The Two Large Open Cuts. Ore Parallels Poorly Developed Schistosity In Serpentine
Tectonic:	Sierra Foothills Accreted Terrane
Alteration processes:	Ultramafic Rocks Serpentinized In Small Stringers And Lenses From 1 In. To Several Ft Thick

References

MRDS	M700413
DEP	10109804
Reference	{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}
Reporter	Oster, Karel L. (Albers, John P.), Peterson, Jocelyn A.