Unnamed (southwest of the head of Snowslide Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Sb; Zn
Other commodities As; Au
Ore minerals arsenopyrite; chalcopyrite; galena; pyrite; pyrrhotite; sphalerite; stibnite
Gangue minerals adularia; calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-2
Latitude 63.3154
Longitude -144.6449
Nearby scientific data Find additional scientific data near this location
Location and accuracy This unnamed occurrence is about one-half mile west of the head of Snowslide Creek at an elevation of about 5,900 feet. It is about one-half mile northeast of the center of section 34, T. 18 S., R. 16 E., Fairbanks Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is part of a northwest-trending set of structurally controlled sulfide veins and veinlets that are intermittently exposed for about 9 miles between the Robertson Glacier and the glacier at the head of the West Fork Robertson River. Coarse-grained pyrite, arsenopyrite, galena, sphalerite, and stibnite occur in a gangue of quartz and carbonate with patches of adularia (?). The veins crosscut both bedding and schistosity but are locally parallel to them. The rocks in this area are siliceous metasedimentary rocks that include quartzite, quartz arenite, and siliceous siltstones (R.A. Blakestad and others, unpublished Resource Associates of Alaska, Inc. report, 1978).
Samples of the veins show significant amounts of lead, silver, and zinc in most veins and varying amounts of arsenic, antimony, copper, and traces of gold (R.A. Blakestad and others, unpublished Resource Associates of Alaska, Inc. report, 1976). Geologic mapping and geochemical sampling was done from 1976 to 1979. However, most of the work in this area was concentrated on similar veins nearby, such as the RC East prospect (MH255), and there has been no further work in the area.
Geologic map unit (-144.6471458311, 63.315017167976)
Mineral deposit model Polymetallic veins (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Devonian or younger, on the basis of the age of the host rock, which are in the Jarvis Creek Glacier subterrane (Nokleberg and others, 1992).

Production and reserves

Workings or exploration Geologic mapping and geochemical sampling was done from 1976 to 1979. However, most of the work in this area was concentrated on similar deposits nearby.
Indication of production None

Additional comments

Unpublished data cited is available for viewing by contacting Grayd Resources Inc. in Vancouver, B. C., Canada (www.grayd.com), or Northern Associates Inc. in Fairbanks, Alaska.

References