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Carlson

Prospect, Inactive

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Commodities and mineralogy

Main commodities Ag; Cu
Ore minerals chalcopyrite; pyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale A-3
Latitude 60.042
Longitude -147.8306
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located in the SW1/4 section 36, T. 1 S., R. 9 E., of the Seward Meridian, at an elevation of 60 feet. It is 1.6 miles southeast of Gibbon Peak on Latouche Island. This is location 263 of Tysdal (1978 [MF-880-A]) and location S-12 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The prospect consists of a shear zone that trends N 29 E and dips 75 W; it is roughly parallel to the strike of the graywacke (Kurtak and Jeske, 1986). Nelson and others (1985) mapped this area as Orca Group of early Tertiary age. Within the shear zone, pyrrhotite, pyrite, and chalcopyrite occur in a massive zone as much as 1 foot wide and in stringer zones as much as 5 feet wide. The mineralization can be traced for 200 feet along the zone trend. Drag folds affect both the graywacke and massive sulfide stringers associated with the shear zone (Hoekzema and Sherman, 1983).
Workings on the prospect consist of a 100-foot adit that is mostly submerged at high tide. A shaft was sunk on a cliff at 60 feet above high tide; it later flooded (Bateman, 1928). The U.S. Bureau of Mines visited the prospect in 1985 but found no signs of workings (Kurtak and Jeske, 1986). They collected three chip samples from the shear zone and one from mineralized graywacke. The samples contained from 0.7 percent to 2.5 percent copper and from 0.92 ppm to 20 ppm silver (Kurtak and Jeske, 1986).
Geologic map unit (-147.832592670835, 60.0413582836753)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b
Age of mineralization Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration Workings on the prospect consist of a 100-foot adit that is mostly submerged at high tide. A shaft was sunk on a cliff 60 feet above high tide; it later flooded (Bateman, 1928). The U.S. Bureau of Mines visited the prospect in 1985 but found no signs of workings (Kurtak and Jeske, 1986). They collected three chip samples from the shear zone and one from mineralized graywacke. The samples contained from 0.7 percent to 2.5 percent copper and from 0.92 ppm to 20 ppm silver (Kurtak and Jeske, 1986).
Indication of production None

Additional comments

A. M. Bateman, a consultant for Kennecott Copper Company, investigated this property. His report (Bateman, 1928) is available on request from the Minerals Division, Bureau of Land Management, Anchorage, Alaska. This site has also been called Carlson Property Latouche Island Copper Mining Co.

References

References

Bateman, A.N., 1928, Unpublished consultant report to Kennecott Copper Corp., Seattle, Washington 1916-1927; held at the U.S. Bureau of Land Management Alaska State Office, Anchorage, 1 v.
Cobb, E.H., and Tysdal, R.G., 1980, Summaries of data on and list of references to metallic and selected nonmetallic mineral deposits in the Blying Sound and Seward quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-621, 276 p.
Condon, W.H., and Cass, J.T., 1958, Map of a part of the Prince William Sound area, Alaska, showing linear geologic features as shown on aerial photographs: U.S. Geological Survey Miscellaneous Investigations Series Map I-273, 1 sheet, scale 1:125,000.
Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, southcentral Alaska: U.S. Bureau of Mines Mineral Land Assessment 5-84, 218 p., 2 sheets, scale 1:250,000.
Kurtak, J.M., and Jeske, R.E., 1986, Mineral investigations in the Chugach National Forest, Alaska (Islands area): U.S. Bureau of Mines Open-File Report 54-86, 302 p., 1 sheet, scale 1:63,360.
Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.
Tysdal, R.G., 1978, Mines, prospects, and occurrences map of the Seward and Blying Sound quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-880-A, 2 sheets, scale 1:250,000.
Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 12/23/2000