Tin Creek-South Occurrence, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Tin Creek-South Occurrence	Occurrence
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: 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).
Geology: The Tin Creek Zn-Pb skarn is zoned from predominantly a garnet skarn with abundant chalcopyrite and stockwork quartz veining in the northern part (MW zone) to a pyroxene skarn dominated by sphalerite in the southern part (TC1 zone) (Lu et al., 1992).
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.
Workings: 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.
Age: Unknown; younger than 65 Ma Veleska Lake Volcanic Field.

Commodities (Major) - Ag, Cu, Pb, Zn; (Minor) - Bi, Co, Cd
Development Status: No
Deposit Model: Low temperature lead-zinc skarn (Cox and Singer, 1986; model 18c).

Other Databases

Link to USGS - Alaska:	MG046

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References