Snowden Creek

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Gypsum
Ore minerals chalcopyrite; gypsum; pyrite
Gangue minerals calcite; graphite; quartz

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale D-6
Latitude 67.76
Longitude -149.71
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Snowden Creek occurrence is approximately 3 miles south-southwest of Snowden Mountain. It is near the 3,000-foot level of a ridge immediately north of lower Snowden Creek and overlooking the Dietrich River (sec. 24, T. 34 N., R. 10 W., of the Fairbanks Meridian). The location is accurate within a 1/2-mile radius.

Geologic setting

Geologic description

This occurrence consists of: (a) a 6-inch-thick gypsum-calcite zone in shaly limestone which contains abundant fine-grained pyrite; and (b) vein quartz float that contains traces of graphite, pyrite, and chalcopyrite (Mulligan, 1974). Dillon and others (1988) mapped the country rocks as a Devonian igneous unit of diabase, gabbro, and diorite dikes and sills that is in contact with Middle Ordovician black, carbonaceous phyllite and meta-limestone. Calc-silicate hornfels occurs along the contact. Cr, Pb, Ni, and V were detected spectrographically in samples from the occurrence (Mulligan, 1974).
Geologic map unit (-149.712771215502, 67.7595936836938)

Production and reserves

Indication of production None