|Quadrangle map, 1:250,000-scale||TE|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Dese Creek is a north-flowing stream whose mouth is on the southeast shore of Grantley Harbor, 7 miles southeast of Teller. As mapped by Sainsbury and others (1969), placer mining operations took place along 1.5 miles of the main drainage at surface elevations of 45 to 180 feet. This is locality 86 of Cobb and Sainsbury (1972). Cobb (1975) summarized relevant references under the name 'Dese Cr.'.|
Geologic descriptionBedrock in the Dese Creek drainage is a metapelitic sequence with local metamorphosed mafic intrusive bodies (Sainsbury, 1972). In places, the retrograded greenschist facies mafic bodies preserve remnant blueschist facies minerals. The age of this assemblage is unknown but it is probably Paleozoic. Sainsbury and others (1969) mapped placer workings along 1.5 miles of the main drainage at surface elevations of 45 to 180 feet. Mining took place primarily between 1927 and 1946 and included several years of dredge operations (Cobb, 1975). Heavy mineral concentrates from placer operations contained cinnabar. Sainsbury and others (1969) report anomalous mercury levels in stream sediments above the area of placer operations. The character of the placer deposit has not been described. The area is low enough that Quaternary marine transgressions could have affected the placer deposit.
|Geologic map unit||(-166.202668754071, 65.2052330984968)|
|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, mostly dredging, have taken place along 1.5 miles of the main drainage between surface elevations of 45 and about 180 feet.|
|Indication of production||Yes|
|Reserve estimates||Not defined|
|Production notes||Not known|
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|