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McCaleb's Sourdough No. 2

Minor podiform chromite deposit, 12 of 15 in Curry county (in Oregon)

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

Geologic Information
CountryUnited States
State or provinceOregon
Geographic location:42°16'40"N, 123°50'10"W
(-123.836111, 42.277778)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeMinor Podiform
Deposit formbanded zone, lenses
Deposit texturedisseminated, massive
Ore typeMetallurgical
Age of depositMiddle Jurassic (164-162 Ma)
Age (m.y.)163million years
Area of deposit225.7sq m
Ore body length61m
Ore body width3.7m
Host rock typedunite
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
hornblende diorite
metavolcanic rocks
amphibole gneiss
Geologic map unit-123.836111111111, 42.2777777777778
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date1950s
Startup date1950s
Tonnage0.003million metric tons
Ore depth0m
Cr2O3 grade25percent
Cr:Fe ratio2.5
Reference information
CommentsBanded zone is 1.5-3.7 m thick. 1953-1956, production estimated at 3,000 t of ore with about 25% Cr2O5 to produce concentrates of 1219 t with 50% Cr2O3, 2.5 Cr:Fe. Curry County.
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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