Quadrangle map, 1:250,000-scale | NB |
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Quadrangle map, 1:63,360-scale | A-4 |
Latitude | 62.1548 |
Longitude | -142.8302 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This prospect is on the lower-west flank of the large ridge east of Nabesna Glacier. It is at an elevation of about 3,500 feet in a small drainage about 5,000 feet west of peak 6045 and 1,500 feet east of the glacier. The site is in the SW1/4 of section 3, T. 4 N., R. 14 E. of the Copper River Meridian. This is locality 7 of Richter (1973), locality 24 of Richter and others (1975), and National Park Service locality WRST-42 (unpublished data). Cobb and Richter (1980 [OFR 80-927]) include this locality as an 'Unnamed prospect'. It is located to within a few hundred feet. |
Geologic descriptionHydrothermally altered porphyry dikes and small masses of quartz diorite contain disseminated pyrite and chalcopyrite; local stockworks of quartz veins with pyrite and chalcopyrite also cut volcanic country rocks (Richter and Matson, 1970 [OFR 70-276]; Richter and others, 1975). Assays of 3 rock samples from this area contained 0.2 to 0.4 ounce gold per ton. One is a 200-foot composite chip sample of pyrite-bearing sericitized porphyry that contained 0.04 ounce of gold per ton and 2,000 parts per million copper (Richter and Matson, 1970 [OFR 70-276]). The altered intrusive rocks are Tertiary in age (Richter, 1973). They cut volcanic rocks and argillite of the upper Paleozoic Tetelna Volcanics (Richter, 1973; 1976). | |
Geologic map unit | (-142.832326088903, 62.1544069529768) |
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Mineral deposit model | Disseminated and stockwork veins with copper and gold |
Age of mineralization | The altered and mineralized intrusive rocks are considered to be Tertiary (Richter, 1973). |
Alteration of deposit | Quartz-sericite-pyrite replacement and veining. |
Workings or exploration | Surface prospecting has occurred in this area. |
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Indication of production | None |
Additional commentsThe prospect is in the Wrangell-St. Elias National Preserve. |
MRDS Number | A011397 |
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References | |
Reporters | Travis L. Hudson (Applied Geology) |
Last report date | 11/24/2002 |