|Quadrangle map, 1:250,000-scale||IL|
|Quadrangle map, 1:63,360-scale||A-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This lode prospect is at an elevation of about 1,800 feet in locally-named Sargent Creek (Richter and Herreid, 1965). Sargent Creek was called Crevice Creek by Jasper (1953, 1956). The prospect is near the center of the N1/2 SW1/4 sec. 15, T. 12 S., R. 32 W., Seward Meridian. The prospect coincides with number 7 of Richter and Herreid (1965) and may correspond approximately wth locality 19 of Detterman and Cobb (1972). The location is accurate within 500 feet.|
Geologic descriptionThe country rocks at this prospect are chiefly intermediate and basic volcanic rocks of the Jurassic Talkeetna Formation (Richter and Herreid, 1965; Detterman and Reed, 1980). The deposit was largely snow covered when visited by Richter and Herreid, but they described dump samples of epidote-garnet tactite (skarn), garnet-magnetite skarn, massive magnetite, and massive magnetite-calcite rock. The samples were copper-stained, presumably by malachite and azurite, and contained chalcopyrite.
|Geologic map unit||(-154.656115786815, 59.1362096241572)|
|Mineral deposit model||Fe skarn, Cu skarn (Cox and Singer, 1986; models 18d, 18b).|
|Mineral deposit model number||18d, 18b|
|Age of mineralization||Probably Jurassic, the age of the nearby Pilot Knob granodiorite (IL041) (Richter and Herreid, 1965).|
|Alteration of deposit||Contact metasomatism. Oxidation of copper.|
|Workings or exploration||Test pits were largely snow covered when visited by Richter and Herreid (1965); the claim-owner (Sargent) reported good showings of disseminated chalcopyrite. The deposit was probably covered by the McNeil (IL043) claims.|
|Indication of production||None|
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.
Jasper, M.W., 1953, Preliminary report on copper occurrences on McNeil claim group, Paint River area, Kamishak Bay region: Alaska Territorial Department of Mines Property Examination 103-1, 14 p., 6 sheets.
Jasper, M.W., 1956, McNeil copper claim group, Paint River area: Alaska Territorial Department of Mines Property Examination 103-2, 19 p., 3 sheets.
|Reporters||C.C. Hawley, Hawley Resource Group, Anchorage, Alaska|
|Last report date||6/10/2003|