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Little Siberia

Minor podiform chromite deposit, 11 of 15 in Curry county (in Oregon)

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

Geologic Information
CountryUnited States
State or provinceOregon
Geographic location:42°16'35"N, 123°50'53"W
(-123.848056, 42.276389)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeMinor Podiform
Deposit formzone, lenses, stringers
Deposit texturedisseminated, schlieren-banded, nearly massive
Ore typeMetallurgical
Age of depositMiddle Jurassic (164-162 Ma)
Age (m.y.)163million years
Mineralogychromite
Host rock typeserpentinized dunite
Host rock length18000
Host rock width6300
Paleotectonic settingsuprasubduction
Ophiolite zonetectonite
Deposits < 10kmpodiform chromite, low-sulfide gold veins, placer gold, mafic volcanogenic massive sulfide, magmatic magnetite in pyroxenite
Rocks within 5kmdunite
serpentine
harzburgite
pyroxenite
granodiorite
hornblende diorite
amphibolite
gabbro
metavolcanic rocks
amphibole gneiss
schist
Geologic map unit-123.848055555556, 42.2763888888889
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date1951
Startup date1951
Tonnage0.000198million metric tons
Ore depth0m
Cr2O3 grade55percent
Fe %13.14percent
Cr:Fe ratio2.8
Reference information
CommentsMaximum thickness of ore zone is 1.52 m. Similar to ore at Pearsoll mine. 1951-1955 produced 198 t of mill ore. Assay 55.07% Cr2O3. Curry County.
References
Ramp, Len, 1961, Chromite in southwestern Oregon: Oregon Department of Geology and Mineral Industries Bulletin 52, 169 p.
Ramp, Len, 1975, Geology and mineral resources of the Upper Chetco drainage area, Oregon: Oregon Department of Geology and Mineral Industries Bulletin 88, 47 p.
Evans, J.G., 1984, Structure of part of the Josephine Peridotite, northwestern California and southwestern Oregon: U.S. Geological Survey Bulletin 1546-A, p. 7-37.
Harper, G.D., Saleeby, J.B., and Heizler, M., 1994, Formation and emplacement of the Josephine ophiolite and the Nevadan orogeny in the Klamath Mountains, California-Oregon--U/Pb zircon and 40Ar/39Ar geochronology: Journal of Geophysical Research, v. 99, B3, p. 4293-4321.
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