Commodities
PrimaryChromium
TertiaryIridium, Platinum, Palladium, Ruthenium, Rhodium
Commodity typeM
Deposit
Model15: Podiform chromite (minor)
Deposit sizeS
WorkingsUnderground
Orebody formNARROW HIGH-GRADE STRINGERS
Ore controlMagmatic Segregation
Materials
Ore mineralsChromite
GangueOpal, Tremolite
Geology
Host rockDunite
Associated rockPeridotite · Coast Ranges Ophiolite
StructureNumerous Small Joints And Fissures
Tectonic settingCalifornia Coast Ranges
AlterationDunite And Peridotite Now Mostly Serpentinite
Economic & production
Development statusPast Producer
Identification
Deposit ID10043642
MRDS IDM100460
RegionNA
Data scoreB
Coordinates35.37803, -120.70264
References
WALKER, G.W., AND GRIGGS, A.B., 1953, GEOLOGICAL INVESTIGATIONS OF CHROMITE IN CALIFORNIA: CALIFORNIA DIVISION OF MINES BULLETIN 134, PT. 2, CH. 2, P. 82.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.SMITH, C.T., AND GRIGGS, A.B., 1944, CHROMITE DEPOSITS NEAR SAN LUIS OBISPO, SAN LUIS OBISPO COUNTY, CALIFORNIA: U.S. GEOLOGICAL SURVEY BULLETIN 945-B, P. 36.ALLEN, J.E., 1941, GEOLOGICAL INVESTIGATION OF THE CHROMITE DEPOSITS OF CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY V. 37, NO. 1, P. 161.