Mine detail: Grey Claim

Location:	Napa County, California, United States, North America
Lat / long:	38.8096, -122.37162
dep_id:	10031651
mrds_id:	M010775
Commodity type:	metallic
Major mineral:	Chromium
Trace mineral:	Ruthenium, Platinum, Palladium, Iridium, Rhodium
Operation type:	Unknown
Production size:	Small ammount of material produced
Development status:	Past Producer
ore:	Chromite
gangue:	Olivine
orebody_fm:	CLOSELY PACKED LENSES
work_type:	Surface/Underground
model:	15: Podiform chromite (minor)
conc_proc:	Magmatic Segregation
ore_ctrl:	Magmatic Segregation
Reporter:	Gere, W., Peterson, Jocelyn A.
hrock_type:	Dunite
arock_unit:	Coast Range Ophiolite
arock_type:	Peridotite
Structure:	Shear Zone
tectonic:	California Coast Ranges
References:	Deposit:: DOW, D.H., AND THAYER, T.P., 1946, GEOLOGICAL INVESTIGATIONS OF CHROMITE IN CALIFORNIA: CALIFORNIA DIVISION OF MINES BULLETIN 134, PT. 2, CH. 1, P. 21. 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:: AVERITT, PAUL, 1945, QUICKSILVER DEPOSITS OF THE KNOXVILLE DISTRICT, NAPA, YOLO, AND LAKE COUNTIES, CALIFORNIA: CALIFORNIA JOURNAL OF MINES AND GEOLOGY V. 41, NO. 2, PL. 6.