Quadrangle map, 1:250,000-scale | BG |
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Quadrangle map, 1:63,360-scale | D-4 |
Latitude | 60.9832 |
Longitude | -142.4983 |
Nearby scientific data | Find additional scientific data near this location |
Location and accuracy | This occurrence is on the north side of the valley of 'Bearhole Creek', which is not named on the D-4 and adjacent D-5 quadrangles (Brabb and Miller, 1962) at an elevation of about 4,500 feet and 1.7 miles west-northwest of peak 6560. It is in the SW 1/4 of section 24, T 10 S, R 16 E of the Copper River Meridian. The location is probably accurate to within a half mile. It is locality 1 of Cobb (1972 [MF 373]; 1979 [OF 79-1246]). |
Geologic descriptionA 20-foot-wide mineralized zone in Mesozoic metasedimentary rocks contains as much as 20 percent pyrite and graphite and traces of chalcopyrite (Brabb and Miller, 1962). The zone contains quartz-feldspar-graphite veins; it is light colored and visible from a distance. Brabb and Miller (1962) observed similar mineralization locally on the south side of Bearhole Creek. | |
Geologic map unit | (-142.500307479378, 60.9827556482035) |
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Mineral deposit model | Shear zone with quartz-feldspar-graphite veins? |
Age of mineralization | Tertiary? The mineralized zone may trend north-south across Bearhole Creek and crosscut the host metasedimentary rocks. High-grade metamorphism in this area is Early Tertiary in age (Hudson and Plafker, 1982). |
Alteration of deposit | Light color may indicate oxidation. |
Workings or exploration | Reconnaissance surface observations have been completed at this locality (Brabb and Miller, 1962). |
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Indication of production | None |
Additional commentsThis occurrence is within the Wrangell-St. Elias National Park. |
MRDS Number | 10307241 |
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ReferencesHudson, T.L., and Plafker, George, 1982, Paleogene metamorphism of an accretionary flysch terrane, eastern Gulf of Alaska: Geological Society of America Bulletin, v. 93, p. 1280-1290.
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Reporters | Travis L. Hudson |
Last report date | 12/12/2001 |