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Unnamed (northwest of upper Watana Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Au
Other commodities Ag; Cu; Sb

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale D-2
Latitude 62.9472
Longitude -147.7985
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,700 feet on the northwest side of upper Watana Creek. It is approximately 1.5 miles southeast of VABM Watana, in the NE1/4SE1/4 sec. 18, T. 33 N., R. 9 E., Seward Meridian. The location is accurate to within 1/4 mile.

Geologic setting

Geologic description

This occurrence is a small gossan zone at the contact of maroon amygdaloidal basalt and overlying, buff-weathering dolomitic limestone. Upper Triassic fossils occur in the limestone, 1,000 feet north of the gossan (Csejtey and others, 1978; J. Schmidt, written communication, 2001). A U.S. Geological Survey sample contains 3.3 parts per million gold, 1.0 part per million silver, 293 parts per million copper, and 115 parts per million antimony. (The 3.3-ppm gold value is from an ICP analysis by XRAL Laboratories; a fire assay on the sample gives 0.024 ppm gold. The cause of this discrepancy is not known.)
Geologic map unit (-147.800748191828, 62.9467444807773)
Mineral deposit model Basaltic copper? (Cox and Singer, 1986; model 23?)
Mineral deposit model number 23?
Alteration of deposit The basalt is oxidized.

Production and reserves

Workings or exploration Only surface sampling by U.S. Geological Survey (J. Schmidt, written communication, 2001).
Indication of production None

References

References

Csejtey, Bela, Jr., Nelson, W.H., Jones, D.L., Silberling, N.J., Dean, R.M., Morris, M.S., Lanphere, M.A., Smith, J.G., and Silberman, M.L, 1978, Reconnaissance geologic map and geochronology, Talkeetna Mountains quadrangle, northern part of Anchorage quadrangle, and southwest part of Healy quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-558-A, 60 p., 1 sheet, scale 1:250,000.
Reporters R.K. Rogers (U. S. Geological Survey contractor)
Last report date 10/4/2002