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Unnamed Prospect (ARDF - NB082; north side of Carl Creek), Chisana District, Southeast Fairbanks Borough, Alaska, USA

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Latitude & Longitude (WGS84): 62° 2' 42'' North , 141° 34' 51'' West
Latitude & Longitude (decimal): 62.045, -141.580833333


The prospect is in the Wrangell-St. Elias National Preserve.
Location: This prospect is on the nose of a low, southeast-trending ridge on the east wall of the valley of Carl Creek . It is at an elevation of about 5,100 feet, about 1.1 miles southeast of peak 7064, about 1.5 miles west-northwest of peak 6820. The site is in the NW1/4 of section 16, T. 3 N., R. 21 E. of the Copper River Meridian. This is locality 5 of Richter and Matson (1970), locality 46 of Richter and others (1975), and is included in National Park Service locality 92 (unpublished data). Cobb and Richter (1980) included this prospect under the name 'Carl Cr.'. It is located to within a few hundred feet.
Geology: Pyrite and chalcopyrite occur in quartz veinlets and as disseminations in granodiorite and quartz monzonite of the Cretaceous, Klein Creek pluton (Richter and Matson, 1970 [OFR 70-275]; Richter and others, 1975; Richter and Jones, 1973; Richter, Lanphere, and Matson, 1975). The mineralization is in a 300- by 600-foot hydrothermally altered zone characterized by veins of quartz and sericite. Surface samples average about 0.01 percent copper and less than 0.01 percent molybdenum. A grab sample of limonite-stained granodiorite contained 0.2 parts per million (ppm ) gold and 700 ppm copper (Richter and Matson, 1970 [OFR 70-275]). The deposit is estimated to contain about 8 million tons of material with a grade of 0.20 percent copper and very low amounts of molybdenum (Richter and others, 1975). The Klein Creek pluton has a K/Ar date of 111 +/- 3.6 Ma (Richter, Lanphere, and Matson, 1975). This pluton intrudes volcanic rocks of the Cretaceous, Chisana Formation in the area of Carl Creek (Richter and Jones, 1973).
Workings: Surface prospecting has occurred since 1967.
Age: Related to Cretaceous pluton; the Klein Creek pluton has a K/Ar date of 111 +/- 3.6 Ma (Richter, Lanphere, and Matson, 1975).
Alteration: Quartz-sericite-pyrite veining and replacement(?); oxidation has produced iron- and copper-staining.
Reserves: The deposit is estimated to contain about 8 million tons of material with a grade of 0.20 percent copper and very low amounts of molybdenum (Richter and others, 1975).

Commodities (Major) - Cu; (Minor) - Ag, Au, Mo
Development Status: None
Deposit Model: Porphyry Cu-Mo (Cox and Singer, 1986; model 21a)

Mineral List


5 valid minerals.

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References

Cobb, E.H., and Richter, D.H., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Nabesna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-927, 117 p. Richter, D.H., and Jones, D.L., 1973, Reconnaissance geologic map of the Nabesna A-2 quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-749, 1 sheet, scale 1:63,360. Richter, D.H., and Matson, N.A., Jr., 1970, Geochemical data from the Nabesna A-2 quadrangle, Alaska: U.S. Geological Survey Open-File Report 70-275, 12 p., 1 sheet, scale 1:63,360. Richter, D.H., Lanphere, M.A., and Matson, N.A., Jr., 1975, Granite plutonism and metamorphism, eeastern Alaska Range, Alaska: Geological Society of American Bulletin, v. 86, p. 819-820. Richter, D.H., Singer, D.A., and Cox, D.P., 1975, Mineral resources map of the Nabesna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-655-K, 1 sheet, scale 1:250,000. Singer, D.A., Berger, V.I., and Moring, B.C. (2005): Porphyry Copper Deposits of the World: Database, Map, and Grade and Tonnage Models. USGS Open-File Report 05-1060.

 
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