Mine detail: Sweetwater Mine

Previously called 'San Juan MinePierce and Benadom Group'

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Location

Lat / long: 35.41803, -120.75459

Resource(M)

Primary: Chromium
Tertiary: Platinum, Palladium, Iridium, Ruthenium, Rhodium
Ore: Chromite
Gangue: Antigorite, Picotite, Spinel
Orebody form: PODS, STREAKS, CLOTS, DISCRETE GRAINS, KIDNEY SHAPED BODIES

Production

Operation type: Unknown
Production size: Small
Development status: Past Producer
First production started: 1885

Geology

Host type:Dunite
Associated rock:Coast Range Ophiolite
Associated type:Peridotite
Structure:Prevalent Shearing
Tectonic:California Coast Ranges
Alteration processes:Dunite Is Serpentinized

References

MRDSM100580
DEP10043681
Reference{Deposit:: 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. 48, 67.}{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:: STINSON, M.C., 1975, CALIFORNIA DIVISION OF MINES AND GEOLOGY MINERAL PROPERTY REPORT, UNPUB.}{Deposit:: 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. 36-37.}{Deposit:: BRADLEY, W.W., HUGUENIN, EMILE, LOGAN, C.A., TUCKER, W.B., AND WARING, C.A., 1918, MANGANESE AND CHROMIUM IN CALIFORNIA: CALIFORNIA STATE MINING BUREAU BULLETIN 76, P. 177-178.}{Deposit:: ALLEN, J.E., 1941, GEOLOGICAL INVESTIGATION OF THE CHROMITE DEPOSITS OF CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY V. 37, NO. 1, P. 140.}{Production:: STINSON, 1975}
ReporterOster, Karel L. (Albers, John P.), Peterson, Jocelyn A.