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Tin Creek-North Occurrence, McGrath District, Yukon-Koyukuk Borough, Alaska, USA

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See MG042, Tin Creek-Midway (MG043) and Tin Creek-South (MG046) prospects.
Location: The Tin Creek-North occurrence is located near a 4,955 foot (1,510 m) summit about 6 kilometers east of Sheep Creek. The reporter visited the site in 1980.
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-North occurrence consists of thin, 5 to 20 centimeter thick mineral veins containing johansenite, garnet, sphalerite (marmatite), and chalcopyrite in argillaceous limestone of the mid-Silurian Terra Cotta Mountains Sandstone a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997). The mineralization is hosted within a thermally altered zone where prograde garnet-johansenite veins are cut by epidote replacement bodies that are accompanied by sulfide minerals. The sulfide skarns are near a 29 Ma granidiorite dike which is part of a larger, 5 kilometer wide, N70W-trending dike swarm which intrudes the Dillinger subterrane. One grab sample contained 2.25 percent copper, 1.21 percent lead, 0.11 percent zinc, 0.13 percent cadmium, and 319.8 grams/tonne silver (Bundtzen, Kline, and Clough, 1982; Szumigala, 1987).
Workings: The Tin Creek-North occurrence was first described in Bundtzen, Kline, and Clough (1982). One grab sample contained 2.25 percent copper, 1.21 percent lead, 0.11 percent zinc, 0.13 percent cadmium, and 319.8 grams/tonne silver (Bundtzen, Kline, and Clough, 1982; Szumigala, 1987).
Age: Inferred to be 29 Ma, based on age date from nearby granodiorite dike (Solie and others, 1991).
Alteration: Epidotization.
Reserves: None.

Commodities (Major) - Ag, Cu, Pb, Zn; (Minor) - Cd
Development Status: No
Deposit Model: Copper-iron skarn (Cox and Singer, 1986; model 18b).

Mineral List



7 entries listed. 5 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

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.

Szumigala, D.J., 1987, Geology of the lead-zinc skarn deposits at Tin Creek area, McGrath B-2 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 87-5, 21 p., 1 sheet, 1:10,000 scale.

Lu, C.S., Reed, M.H., and Misra, K.C. (1992): Zinc-lead skarn mineralization at Tin Creek, Alaska - fluid inclusions and skarn-forming reactions. Geochimica et Cosmochimica Acta, 56, 109-120.

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.

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