|Quadrangle map, 1:250,000-scale||IL|
|Quadrangle map, 1:63,360-scale||C-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Durand (Durant) prospect is at an elevation of about 500 feet on the north-facing slope above Durants Cove in Pile Bay. The site is in the SE1/4 sec. 27, T. 5 S., R. 28 W., Seward Meridian. The location is number 4 of Detterman and Cobb (1972), and is accurate within 0.5 mile.|
Geologic descriptionThe country rock at the Durand prospect is the Upper Triassic Cottonwood Bay Greenstone, which consists chiefly of porphyrytic and amygdaloidal basalt flows and minor mafic intrusive rock (Detterman and Reed, 1980). The prospect is a 10-foot-wide quartz vein that strikes N 80 E and dips 45N; it contains disseminated masses of pyrite and chalcopyrite, locally oxidized to azurite and malachite (Martin and Katz, 1912). A small magnetite body that crops out near the vein has been staked (Cobb, 1976). Martin and Katz (1912, p. 123) suggested that two quartz veins in greenstone about 2 miles to the south might be extensions of the veins at the Durand prospect. Dioritic intrusions of Jurassic age are exposed northeast and southwest of the Triassic greenstone (Detterman and Reed, 1980), and Jurassic intrusions could underlie the Durand prospect area at shallow depth.
|Geologic map unit||(-154.015757578152, 59.7081328311694)|
|Mineral deposit model||Polymetallic vein? (Cox and Singer, 1986; model 22c?). The magnetite deposit is possibly Alaska PGE? (Cox and Singer, 1986; model 9?).|
|Mineral deposit model number||22c?, 9?|
|Age of mineralization||The Durand vein is LateTriassic or younger. The magnetite deposit is probably Jurassic.|
|Alteration of deposit||Oxidation of copper.|
|Workings or exploration||Martin and Katz (1912) reported shallow exploration pits on two claims in the prospect area.|
|Indication of production||None|
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-485, 101 p.
Detterman, R.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Iliamna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-364, 1 sheet, scale 1:250,000.
Detterman, R.L., and Reed, B.L., 1980, Stratigraphy, structure, and economic geology of the Iliamna quadrangle, Alaska: U.S. Geological Survey Bulletin 1368-B, 86 p.
|Reporters||C.C. Hawley, Hawley Resource Group, Anchorage, Alaska|
|Last report date||6/5/2003|