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Pearsoll

Minor podiform chromite deposit, 10 of 15 in Curry county (in Oregon)

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

Geologic Information
CountryUnited States
State or provinceOregon
Geographic location:42°17'52"N, 123°50'40"W
(-123.844444, 42.297778)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeMinor Podiform
Deposit formlenses
Deposit texturemassive, disseminated
Ore typeMetallurgical
Age of depositMiddle Jurassic (164-162 Ma)
Age (m.y.)163million years
Mineralogychromite
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, volcanogenic gold, magnetite in pyroxenite
Rocks within 5kmdunite
serpentine
harzburgite
pyroxenite
granodiorite
hornblende diorite
amphibolite
gabbro
metavolcanic rocks
amphibole gneiss
schist
Geologic map unit-123.844444444444, 42.2977777777778
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date1950s
Startup date1950s
Tonnage0.000254million metric tons
Ore depth0m
Cr2O3 grade23percent
Fe %13percent
Cr:Fe ratio2.7
Reference information
CommentsProduced 254 t with 23% Cr2O3, concentrated to 97 t with 52% Cr2O3, 13% Fe. 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.
Ramp, Len, and Peterson, N.V., 1979, Geology and mineral resources of Josephine County, Oregon: Oregon Department of Geology and Mineral Industries Bulletin 100, 45 p. and geologic map, scale 1:500,000.
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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