|Quadrangle map, 1:250,000-scale||TE|
|Quadrangle map, 1:63,360-scale||B-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Sunset Creek is a southwest-flowing stream whose mouth is on the north shore of Grantley Harbor, 4 miles northeast of Teller and 6.25 miles southeast of Brevig Mission. Placer mining operations took place 1.4 to 2.1 miles upstream from the mouth at surface elevations of about 40 to 110 feet (Sainsbury and others, 1969). This is locality 66 of Cobb and Sainsbury (1972). Cobb (1975) summarized relevant references under the name 'Sunset Cr.'.|
Bedrock in the Sunset Creek drainage is a chlorite and mica schist assemblage that is locally intruded by small greenstone bodies (Sainsbury, 1972); the age of this assemblage is uncertain but it is probably Paleozoic. Quaternary basalt flows are present at higher elevations in some headwater areas. Small quartz veins are common in the schist bedrock. The placer gold deposit , at least locally high grade, is in a few to several feet of fine gravel on schist and greenstone bedrock that also contains gold in the upper three feet. Scheelite was abundant enough to have been saved during some operations. Mining took place at several different times between 1901 and 1946 and employed several different methods, including dredging and hydraulicking (Cobb, 1975).The deposit is at elevations where Quaternary marine transgressions may have modified the alluvial placer (Sainsbury and others, 1969).
|Geologic map unit||(-166.263686218351, 65.3312346477289)|
|Mineral deposit model||Alluvial Au placer (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary|
|Workings or exploration||Placer mining operations took place 1.4 to 2.1 miles upstream from the mouth at surface elevations of about 40 to 110 feet (Sainsbury and others, 1969). This included mining by several different methods including dredging and hydraulicking.|
|Indication of production||Yes|
|Reserve estimates||Not defined|
|Production notes||Not known|
|MRDS Number||A016067; D002557|
Cobb, E.H., 1975, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Teller quadrangle, Alaska: U.S. Geological Survey Open-File Report 75-587, 130 p.
Cobb, E.H., and Sainsbury, C.L., 1972, Metallic mineral resources map of the Teller quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-426, 1 sheet, scale 1:250,000.
Sainsbury, C.L., 1972, Geologic map of the Teller quadrangle, Seward Peninsula, Alaska: U.S. Geological Survey Map I-685, 4 p., 1 sheet, scale 1:250,000.
Sainsbury, C.L., Kachadoorian, Reuben, Hudson, Travis, Smith, T.E., Richards, T.R., and Todd, W.E., 1969, Reconnaissance geologic maps and sample data, Teller A-1, A-2, A-3, B-1, B-2, B-3, C-1, and Bendeleben A-6, B-6, C-6, D-5, and D-6 quadrangles. Seward Peninsula, Alaska: U.S. Geological Survey Open-File Report 69-236, 49 p., 12 sheets, scale 1:63,360.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||5/10/1998|