Tin Creek-Tributary

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Zn
Ore minerals chalcopyrite; malachite; pyrrhotite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale B-2
Latitude 62.463
Longitude -153.664
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Tin Creek-Tributary occurrence is located in a small, unnamed tributary gulch of Tin Creek at an elevation of approximately 2,800 feet (854 m) in the NE1/4 sec. 2, T. 27 N., R. 24 W., of the Seward Meridian. The location corresponds to mineral occurrence no. 2 of Cobb (1972), and is located to within 1,000 feet (305 m).

Geologic setting

Geologic description

At the Tin Creek-Tributary occurrence, chalcopyrite and other sulfides are localized within one foot of a malachite-stained shear zone that extends for about 6 meters along dip. The shear zone cuts calcareous clastics of the mid-Silurian Terra Cotta Mountains Sandstone, a unit of the Dillinger subterrane (Bundtzen, Harris, and Gilbert, 1997).
Sulfide grab samples contain 0.70 percent copper and 0.15 percent zinc. Nearby stream cobbles contain pyrrhotite, with minor sphalerite and chalcopyrite. Placer concentrates contain anomalous copper and zinc in the nearby stream gulch that cuts the mineralized shear zone (Cobb, 1972).
Geologic map unit (-153.666228065808, 62.4623948331104)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c

Production and reserves

Workings or exploration Sulfide grab samples contain up to 0.70 percent copper and 0.15 percent zinc. Nearby stream cobbles contain pyrrhotite and minor sphalerite. Placer concentrates contain anomalous copper and zinc in a stream gulch that cuts the mineralized area.
Indication of production None
Reserve estimates None.

References