Unnamed (on hill 4372)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Pb; Zn
Other commodities As; Cu; Sb
Ore minerals galena; pyrite; sphalerite; stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MM
Quadrangle map, 1:63,360-scale C-2
Latitude 63.6109
Longitude -150.6416
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is about 500 feet west of the top of hill 4372 in the SW 1/4 SW1/4 section 15, T. 15 S., R. 16 W., Fairbanks Meridian. The location is accurate for a galena-bearing quartz vein, but there may be at least two other mineral showings near this site. Subject to this qualification, the prospect corresponds to number 60 of Bundtzen, Smith, and Tosdal (1976), 282 of Hawley and Associates (1978), 67 of Bundtzen (1981), and 95 of Thornsberry, McKee, and Salisbury (1984).

Geologic setting

Geologic description

The country rocks in the area of this prospect consist of Birch Creek quartzite and mica schist faulted against Spruce Creek metafelsite (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2).
Bundtzen, Smith, and Tosdal (1976) described a two-foot-thick, stibnite-galena-sphalerite-quartz vein at this locality. A sample assayed 0.1 ounce of gold per ton, 48.5 ounces of silver per ton, 0.21 percent copper, 2.1 percent lead, 0.5 percent antimony, and 2.15 percent arsenic. In 1983, Thornsberry, McKee, and Salisbury (1984, v. 2, occurrence 95) mapped a 2- to 3-foot-thick, steeply dipping quartz vein that strikes N75W. The vein assayed 0.23 ounce of gold per ton, 51.3 ounces of silver per ton, 0.33 percent copper, 21.5 percent lead, 14.0 percent zinc, 0.39 percent antimony, and 2.85 percent arsenic.
Geologic map unit (-150.643886381862, 63.6104014460549)
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 The area was mapped and sampled by Bundtzen, Smith, and Tosdal (1976), Hawley and Associates (1978), and Thornsberry, McKee, and Salisbury (1984). Bundtzen's and Hawley's parties found no evidence of previous prospecting at this site. Thornsberry's party found several small pits; it is possible that that their location is a few hundred feet from the locality visited in the earlier investigations.
Indication of production None

Additional comments

The prospect is in Denali National Park and Preserve.

References