Unnamed (upper West Fork of Glen Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Sb
Other commodities Au
Ore minerals arsenopyrite; galena; pyrite; stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-2
Latitude 63.557
Longitude -150.7724
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the west side of the canyon of the upper West Fork of Glen Creek at an elevation of about 3250 feet. It is about 0.5 mile due west of the center of section 1, T. 16 S., R. 17 W., Fairbanks Meridian. The location is accurate within 300 feet. The prospect corresponds to occurrence 68 of Thornsberry, McKee, and Salisbury (1984) and approximately to the location of soil sample 240 of Hawley and Associates (1978).

Geologic setting

Geologic description

The country rock in the area of this prospect is mainly metafelsite of the Spruce Creek sequence; it strikes ENE and dips SE, along the south flank of the Kantishna antiform (MM091) (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2).
The deposit is a foot-thick quartz vein that strikes north and is nearly vertical. The vein contains several percent of arsenopyrite, pyrite, stibnite, and probably galena. Samples of the vein assayed a trace of gold, 1.6 ounces of silver per ton, 1.45 percent lead, 1.2 percent antimony, and 2.25 percent arsenic (Thornsberry, McKee, and Salisbury, 1984, v. 2). A soil sample collected on apparently mineralized residual soil near the prospect contained 13 ppm silver, 0.71 ppm gold, 600 ppm lead, and 500 ppm zinc (sample 240, Hawley and Associates, 1978, fig. 4.1-A(1)).
Geologic map unit (-150.774682858853, 63.5564976132836)
Mineral deposit model Low-sulfide gold-quartz vein or polymetallic vein (Cox and Singer, 1986; model 36a or 22c).
Mineral deposit model number 36a or 22c
Age of mineralization The deposit is assumed to be Eocene (see record MM091).

Production and reserves

Workings or exploration The vein was explored shallow pits of unknown date.
Indication of production None

Additional comments

The prospect is in Denali National Park and Preserve.

References