Quadrangle map, 1:250,000-scale | IL |
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Quadrangle map, 1:63,360-scale | A-5 |
Latitude | 59.1369 |
Longitude | -154.654 |
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) |
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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. |
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Indication of production | None |
MRDS Number | A013049 |
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References | |
Reporters | C.C. Hawley, Hawley Resource Group, Anchorage, Alaska |
Last report date | 6/10/2003 |