Peak 5309 No. 2

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Cu
Ore minerals arsenopyrite; malachite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-7
Latitude 60.3353
Longitude -149.5977
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located on the southwest side of peak 5309 between elevations of 3,000 and 3,600 feet. It is located in the SE1/4 section 22, T. 3 N., R. 2 W., of the Seward Meridian. This is S-217 of Jansons and others (1984). This location is accurate to within 1,500 feet.

Geologic setting

Geologic description

The occurrence consists of a 6-inch- to 6-foot-wide quartz vein averaging 2 feet wide over an exposed length of about 300 feet (Hoekzema and Sherman, 1983). The vein strikes N20E and dips 60-70E. Poorly developed ribbon structures occur in some portions of the vein, and the quartz is very vuggy near the top of the exposure. The vein contains arsenopyrite, pyrite, and malachite (Hoekzema and Sherman, 1983). The host rock is interbedded siltstone and slate of the Valdez Group of Late Cretaceous age (Nelson and others, 1985; Jansons and others, 1984). Four samples assayed only trace amounts of gold, and a trace to 0.02 ounce of silver per ton (Jansons and others, 1984).
Geologic map unit (-149.599858241628, 60.3347357856073)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)
Mineral deposit model number 36a
Age of mineralization Cretaceous or younger; the vein cuts rocks of the Valdez Group of Late Cretaceous age.

Production and reserves

Workings or exploration No workings or improvements are reported in the literature. Four samples contained only trace amounts of gold and a trace to 0.02 ounce of silver per ton (Jansons and others, 1984).
Indication of production None

Additional comments

This occurrence was discovered by the U.S. Bureau of Mines.



Reporters Jeff A. Huber and Carol S. Huber (Anchorage)
Last report date 12/10/2001