|Quadrangle map, 1:250,000-scale||SL|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This site is on a small, unnamed east tributary to the Ongoveyuk River. The Ongoveyuk River flows northeast to Ongoveyuk Lagoon on the northeast coast of St. Lawrence Island. The unnamed east tributary enters Ongoveyuk River 3 1/2 miles upstream of the mouth. The site is the unnamed drainage. It was not included by Cobb (1972, 1980).|
Geologic descriptionThe one stream sediment sample from this drainage contains 2,000 ppm manganese, 0.7 ppm silver, 3,000 ppm barium, 15 ppm molybdenum, and 300 ppm zinc (Patton and Csejtey, 1972). These are possible base metal deposits in sedimentary rocks (synsedimentary or epigenetic). The bedrock here is minimally exposed but includes part of a Mississippian to Triassic limestone, chert, shale, and siltstone sequence that includes a condensed section similar to the Triassic Shublik Formation on the North Slope and in the Brooks Range (Patton and Dutro, 1969). The weakly to moderately anomalous metal values at this site are 2 miles northwest of a drainage (see SL020) where many highly anomalous lead and silver values in stream sediments were found.
|Geologic map unit||(-169.86266818967, 63.3891227579168)|
|Mineral deposit model||Sedimentary exhalative Zn-Pb? (Cox and Singer, 1986; model 31a?).|
|Mineral deposit model number||31a?|
|Age of mineralization||If the stream sediment metal concentrations here reflect mineralization, this mineralization could be stratiform and similar in age to that of the enclosing sedimentary rocks (Mississippian to Triassic). Alternatively, the potential mineralization could be related to mid-Cretaceous quartz monzonite that intrudes Mississippian limestone 2 miles to the east of this drainage (Patton and Csejtey, 1980).|
|Workings or exploration||The one stream sediment sample from this drainage contains 2,000 ppm manganese, 0.7 ppm silver, 3,000 ppm barium, 15 ppm molybdenum, and 300 ppm zinc (Patton and Csejtey, 1972).|
|Indication of production||None|
Cobb, E.H., 1972, Metallic mineral resources map of the Saint Lawrence quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-465, 1 sheet, scale 1:250,000.
Cobb, E.H., 1980, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in fifteen quadrangles in southwestern and west-central Alaska: U.S. Geological Survey Open-File Report 80-909, 103 p.
Patton, W.W., Jr., and Csejtey, Bela, Jr., 1972, Analysis of stream-sediment and rock samples from St. Lawrence Island, Alaska, 1966-1971: U.S. Geological Survey Open-File Report 72-293, 78 p.
Patton, W.W., Jr., and Csejtey, Bela, Jr., 1980, Geologic map of St. Lawrence Island, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-1203, 1 sheet, scale 1:250,000.
|Reporters||Travis L. Hudson (Applied Geology)|
|Last report date||9/10/1998|