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Tin Creek-South

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Other commodities Bi; Co; Cd
Ore minerals galena; pyrite; pyrrhotite; sphalerite
Gangue minerals diopside; garnet

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale B-2
Latitude 62.375
Longitude -153.656
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Tin Creek-South occurrence is situated on a high, rugged, north-to-northeast trending ridgeline about 5 kilometers southwest of Veleska Lake at an elevation of 5,300 feet (1,615 m) in the NW1/4 sec. 1, T. 26 N., R. 24 W., of the Seward Meridian. The reporter visited the occurrence in 1981 (at station no. 81BT484).

Geologic setting

Geologic description

The Tin Creek-South occurrence is a high-grade, sulfide-bearing, diopside-garnet skarn zone associated with a complex, east-west trending dike swarm. The dikes cut the Late Cretaceous Veleska Lake Volcanic Field and the older Cambrian to Devonian Dillinger subterrane (Bundtzen, Kline, and Clough, 1982; Bundtzen, Harris, and Gilbert, 1997). The dikes have not been dated, but are younger than the 65 Ma Veleska Lake Volcanic Field.
Massive sphalerite veins are encased in a diopside-rich garnet skarn zone within a carbonate xenolith less than 2 meters thick. Because the exposure is in rubble-crop, the zone's orientation is unknown. Analytical data summarized by Bundtzen, Harris, and Gilbert (1997) indicate up to 0.04 percent copper, 1.30 percent lead, 14.70 percent zinc, 58.0 grams/tonne silver, 300 ppm cobalt, 200 ppm cadmium, and 1,000 ppm bismuth.
Geologic map unit (-153.658224685639, 62.3743923604543)
Mineral deposit model Low temperature lead-zinc skarn (Cox and Singer, 1986; model 18c).
Mineral deposit model number 18c
Age of mineralization Unknown; younger than 65 Ma Veleska Lake Volcanic Field.

Production and reserves

Workings or exploration The Tin Creek-South occurrence was investigated by the reporter for the Alaska Division of Geological and Geophysical Surveys in 1980 (Bundtzen, Kline, and Clough, 1982). Analytical data summarized by Bundtzen, Harris, and Gilbert (1997) indicate up to 0.04 percent copper, 1.30 percent lead, 14.70 percent zinc, 58.0 grams/tonne silver, 300 ppm cobalt, 200 ppm cadmium, and 1,000 ppm bismuth.
Indication of production None

References

MRDS Number 10307855

References

Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 p., 1 sheet, scale 1:125,000.
Bundtzen, T.K., Kline, J.T., and Clough, J.G., 1982, Preliminary geologiy of the McGrath B-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File report 149, 22 p., 1 sheet, scale 1:40,000.
Reporters T.K. Bundtzen (Pacific Rim Geological Consulting)
Last report date 12/5/1998