|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||Offield Creek is a south-flowing stream whose mouth is on the northeast shore of Grantley Harbor, 9.25 miles east of Teller. The creek is in the southeast corner of the Teller B-3 quadrangle and adjacent parts of the Teller B-2 quadrangle. Placer operations were apparently on upstream parts of the drainage at surface elevations of about 400 feet (Cobb and Sainsbury, 1972). This is locality 70 of Cobb and Sainsbury (1972). Cobb (1975) summarized relevant references under the name 'Offield Cr.'.|
Geologic descriptionBedrock in the Offield Creek drainage is a schistose 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. Although Cobb (1975) states that this creek has been extensively placer mined, primarily in the 1930s, Sainsbury and others (1969) did not show the location of placer workings. The character of the placer deposit has not been described.
|Geologic map unit||(-166.008681291673, 65.3012384969135)|
|Mineral deposit model||Alluvial Au placer (Cox and Singer, 1986; model 39a)|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary|
|Workings or exploration||Cobb (1975) states that this creek has been extensively placer mined.|
|Indication of production||Yes|
|Reserve estimates||Not defined.|
|Production notes||Not known, primarily in the 1930s.|
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|