Commodities
PrimaryChromium
TertiaryPlatinum, Palladium, Iridium, Ruthenium, Rhodium
Commodity typeM
Deposit
Model15: Podiform chromite (minor)
Deposit sizeS
Orebody formLENSES, PODS OF GRANULAR AND MASSIVE CHROMITE TO 2 FT THICK
Ore controlMagmatic Segregation
Materials
Ore mineralsChromite
GangueOlivine, Serpentine
Geology
Host rockDunite · Franciscan Formation
Associated rockGabbro,Peridotite · Coast Range (Del Puerto) Ophiolite
StructureShear Zone Trending N80e
Tectonic settingCalifornia Coast Ranges
AlterationUltramafic Rocks Serpentinized
Economic & production
Development statusPast Producer
First production1918
Identification
Deposit ID10043424
MRDS IDM100179
RegionNA
Data scoreB
Coordinates37.40214, -121.42046
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. 74, 76, 88.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.