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Boyer Group

Minor podiform chromite deposit, 6 of 6 in Trinity county (in California)

Sections of this page: [Geologic] - [Economic] - [Reference]

Geologic Information
CountryUnited States
State or provinceCalifornia
Geographic location:40°22'3"N, 123°5'26"W
(-123.090556, 40.3675)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeunknown
Deposit formstringers
Deposit texturemassive
Ore typeMetallurgical
Age of depositMiddle Jurassic (161-168 Ma)
Age (m.y.)164million years
Ore body length15m
Mineralogychromite
Host rock typeserpentine
Host rock length27000
Host rock width4000
Paleotectonic settingsuprasubduction
Deposits < 10kmpodiform chromite
Rocks within 5kmserpentine
graphitic phyllite
metachert
metavolcanic rocks
quartz-mica schist
diorite
alluvium
Geologic map unit-123.090555555556, 40.3675
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date<1942
Startup date1942
Tonnage0.0001million metric tons
Ore depth0m
Cr2O3 grade47.6percent
Fe %14.5percent
Cr:Fe ratio2.24
Reference information
Comments14.5% Fe, Cr/Fe ratio 2.24. Trinity County.
References
Wells, F.G., and Hawkes, H.E., 1965, Chromite deposits of Shasta, Tehama, Trinity, and Humboldt counties, California, in Geological investigations of chromite in California, Part 1--Klamath Mountains: California Division of Mines Bulletin 134, pt. 1, ch. 3, 191 p.
Strand, R.G., 1962, Geologic map of California, Redding sheet: California Division of Mines and Geology, scale 1:250,000.
Coleman, R.G., 2000, Prospecting for ophiolites along the California continental margin, in Dilek, Y., Moores, E.M., Elthon, D., and Nicolas, A., eds., Ophiolites and oceanic crust--New insights from field studies and the Ocean Drilling Program: Geological Society of America Special Paper 349, p. 351-364.
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