Quadrangle map, 1:250,000-scale | LC |
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Quadrangle map, 1:63,360-scale | A-3 |
Latitude | 60.16 |
Longitude | -154 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | Locality is roughly 800 m south of Kontrashibuna Lake, 3.6 km E-SE of Kasna Creek. This is locality 32 of Nelson and others (1985), locality 33 of MacKevett and Holloway (1977), it roughly corresponds to locality 10 of Cobb (1972), and to Area H and approximately Area I of Eakins (1970). Sec. 20, T. 1 N., R. 27 W., of the Seward Meridian. Locality is accurate within 1,000 m. |
Geologic descriptionThe occurrence consists of quartz-pyrite veins containing coarse molybdenite and other sulfide minerals, near the contact of Tertiary mafic volcanic rocks with an intruding Tertiary granitic body. The veins cut the volcanic rocks, but mineralization dies out when veins enter the nearby granite. Also, much iron-staining, gouge, and mylonite along a NE-trending fault. Eakins (1970, Area H) reports that sediment samples in the vicinity yielded values of up to 240 ppm Cu, 50 ppm Mo, 290 ppm Pb, and 980 ppm Zn. Area I of Eakins, 1.2 km NW of this location, produced stream sediment samples with values of up to 240 ppm Cu, 50 ppm Mo, and 440 ppm Pb. Eakins also reports a sample of molybdenite-bearing granite float. A rock sample from the NE-trending fault yielded 8.5 ppm Ag and 2,000 ppm Pb. Resource Associates of Alaska (1976) proposed that the geology may indicate a copper-molybdenum stockwork porphyry. | |
Geologic map unit | (-154.002196935974, 60.1593396121065) |
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Mineral deposit model | Porphyry Cu-Mo? or Porphyry Mo, Low F? (Cox and Singer, 1986; models 21a? or 21b?) |
Mineral deposit model number | 21a? or 21b? |
Age of mineralization | Tertiary or younger. |
Alteration of deposit | Unknown |
Workings or exploration | Eakins (1970, Area H) reports that sediment samples in the vicinity yielded values of up to 240 ppm Cu, 50 ppm Mo, 290 ppm Pb, and 980 ppm Zn. Area I of Eakins (1970), 1.2 km NW of this location, produced stream sediment samples with values of up to 240 ppm Cu, 50 ppm Mo, and 440 ppm Pb. Eakins also reports a sample of molybdenite-bearing granite float. A rock sample from the NE-trending fault yielded 8.5 ppm Ag and 2,000 ppm Pb. |
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Indication of production | None |
Reserve estimates | No reserves |
Production notes | No production |
Additional commentsSite is in Lake Clark National Park and Preserve. |
MRDS Number | A013002 |
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ReferencesResource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: Contract report for U.S. Bureau of Mines, Contract JO166108, 7 v.
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Reporters | M.L. Miller (USGS); D.P. Bickerstaff (USGS) |
Last report date | 6/15/1998 |