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Lucky Star

Minor podiform chromite deposit, 17 of 69 in Josephine county (in Oregon)

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

Geologic Information
CountryUnited States
State or provinceOregon
Geographic location:42°20'35"N, 123°46'26"W
(-123.773889, 42.343056)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeMinor Podiform
Deposit formpods, stringers
Deposit texturecoarse-grained massive
Ore typeMetallurgical
Age of depositMiddle Jurassic (164-162 Ma)
Age (m.y.)163million years
Area of deposit154sq m
Ore body length14m
Ore body width11m
Mineralogychromite
Host rock typeserpentinized dunite
Host rock length18000
Host rock width6300
Paleotectonic settingsuprasubduction
Ophiolite zonetectonite
Deposits < 10kmpodiform chromite, low-sulfide gold veins, placer gold, silica-carbonate Hg, mafic volcanogenic massive sulfide, volcanogenic gold, volcanogenic Hg
Rocks within 5kmdunite
serpentine
harzburgite
granodiorite
hornblende diorite
amphibolite
gabbro
metavolcanic rocks
amphibole gneiss
schist
Geologic map unit-123.773888888889, 42.3430555555556
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date<1918
Startup date1918
Tonnage0.000508million metric tons
Ore depth0m
Cr2O3 grade47percent
Rh grade0.007g/t
Ir grade0g/t
Ru grade0g/t
Pd grade0g/t
Pt grade0g/t
Cr:Fe ratio2.5
Reference information
CommentsProduction to 1957. Analysis 0-0.014 ppm Rh (Carlson and others, 1985). Josephine County.
References
Ramp, Len, 1961, Chromite in southwestern Oregon: Oregon Department of Geology and Mineral Industries Bulletin 52, 169 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.
Carlson, C.A., Wilson, S.A., Carlson, R.R., Bradley, L., Cornell, J., Gent, C., Gass, W., Groeneboer, H., Haffty, J., Haubert, A., Love, A., McDade, J.M., Moore, R., Riley, L., Moring, B.C., Singer, D.A., and Page, N. J, 1985, Analyses for platinum group elements in samples from podiform chromite deposits, California and Oregon: U.S. Geological Survey Open-File Report 85-442, 15 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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