Unnamed (southwest of Alpha Ridge)

Prospect, Inactive

Commodities and mineralogy

Main commodities Pb; Sb
Other commodities Ag; As; Au; Zn
Ore minerals galena; pyrargyrite; pyrite; stibnite
Gangue minerals ankerite; quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-3
Latitude 63.516
Longitude -151.0463
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 3100 feet on the north flank of the ridge between Brooker Mountain and Alpha Ridge in the Kantishna Hills. It is about 500 feet north of the center of section 21, T. 16 S., R. 18 W., Fairbanks Meridian. The prospect is number 3 of Bundtzen, Smith and Tosdal (1978), Bundtzen (1981), and Thornsberry, McKee, and Salisbury (1984). The descriptions in the two Bundtzen references, however, do not appear to match the prospect. Number 20 of Hawley and Associates (1978) is a minor occurrence about 0.2 mile south of the prospect.

Geologic setting

Geologic description

The country rocks in the area of the prospect are felsitic and quartzitic facies of the Birch Creek Schist (Bundtzen, 1981). The prospect consists of fragments of vein material in sloughed trenches. No veins are exposed in the trenches, which trend about N 40 E, possibly the strike of the vein. The fragments consist of galena, stibnite, and possibly minor pyrargyrite in a quartz-ankerite-tourmaline gangue. T.K. Hinderman collected two samples at the site: one of them assayed 275 ppm silver, 1.1 ppm gold, 0.245 percent arsenic, 0.905 percent zinc, 9.15 percent antimony and 10.5 percent lead (Thornsberry, McKee, and Salisbury, 1984, v. 2, occurrence 3). Hawley and Associates (1978) reported a quartz-pyrite vein about 0.2 mile south of the prospect.
Geologic map unit (-151.048585944275, 63.5154907748134)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization The deposit is assumed to be Eocene (see record MM091).

Production and reserves

Workings or exploration Two shallow trenches were sloughed by 1983.
Indication of production None

Additional comments

The prospect is in Denali Park and Preserve.

References