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  3. Alaska Resource Data File (ARDF)

Unnamed

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Pb

Geographic location

Quadrangle map, 1:250,000-scale SL
Quadrangle map, 1:63,360-scale C-2
Latitude 63.37
Longitude -169.81
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is on an unnamed south tributary to another unnamed stream that flows northwest and enters Ongoveyuk Lagoon at the mouth of the Ongoveyuk River. The site is the segment of the unnamed south tributary that extends from 3 to 6 miles due south of the mouth of the Ongoveyuk River. It was not included by Cobb (1972, 1980).

Geologic setting

Geologic description

Several of the stream sediment samples from this drainage, collected over a length of 1 1/2 miles, contain anomalous metal contents including 0.5 to 1.5 ppm silver and 100 to 500 ppm lead. Barium contents of all the stream sediment samples here are 150 to 500 ppm and their zinc contents are less than 200 to 700 ppm (Patton and Csejtey, 1972). Exposed bedrock in this drainage is a small area of quartz monzonite and Mississippian limestone at its lower end. The cause of the elevated metal values is not apparent but these are the highest and most consistently anomalous silver and lead values in stream sediments from St. Lawrence Island. If these anomalous values reflect mineralization, this mineralization could be stratiform (associated with Mississippian to Triassic sedimentary rocks) or epigenetic (associated with mid-Cretaceous plutonism).
Geologic map unit (-169.812663314195, 63.3691238400077)
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 nearby sedimentary rocks (Mississippian to Triassic). Alternatively, the potential mineralization could be related to mid-Cretaceous quartz monzonite that intrudes Mississippian limestone at the lower end of this drainage (Patton and Csejtey, 1980).

Production and reserves

Workings or exploration Several of the stream sediment samples from this drainage, collected over a length of 1 1/2 miles, contain anomalous metal contents including 0.5 to 1.5 ppm silver and 100 to 500 ppm lead. Barium contents of all the stream sediment samples here are 150 to 500 ppm and their zinc contents are less than 200 to 700 ppm (Patton and Csejtey, 1972).
Indication of production None

References

MRDS Number A106328

References

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