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  3. Alaska Resource Data File (ARDF)

Unnamed (Andy Simons Mountain)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Au
Other commodities Pb; Zn
Ore minerals chalcopyrite; galena; gold; pyrite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-7
Latitude 60.3875
Longitude -149.2994
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located just east of the north summit of Andy Simons Mountain at an elevation of 5,100 feet. It is situated in the SW1/4 section 33, T. 4 N., R. 1 E., of the Seward Meridian. This is location S-222 of Jansons and others (1984). This location is accurate to within 300 feet.

Geologic setting

Geologic description

Country rock in this area is siltstone and slate of the Valdez Group of Late Cretaceous age (Nelson and others, 1985). The occurrence consists of a 1- to 1.5-foot-wide quartz vein that strikes N65E and dips vertically (Hoekzema and Sherman, 1983). Metallic minerals consist of chalcopyrite, galena, pyrite, and sphalerite. Two grab samples assayed 0.06 and 0.08 ounce of gold per ton and 0.16 and 0.25 ounce of silver per ton (Jansons and others, 1984).
Geologic map unit (-149.301536206967, 60.3869309662679)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration There are no workings or improvements reported in the literature. Two grab samples assayed 0.06 and 0.08 ounce of gold per ton and 0.16 and 0.25 ounce of silver per ton (Jansons and others, 1984).
Indication of production None
Reserve estimates The U.S. Bureau of Mines estimated a resource of 50 tons of ore containing 0.076 ounces of gold per ton, and 0.2 ounces of silver per ton (Hoekzema and Sherman, 1983).

References

References

Hoekzema, R.P., and Sherman, G.E., 1983, Mineral investigations in the Chugach National Forest, Alaska (Peninsula study area): U.S. Bureau of Mines in-house report; held at U.S. Bureau of Land Management Alaska State Office, Anchorage, 524 p.
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.
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.
Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 6/15/2001