Unnamed (on Weather Ridge)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Zn
Other commodities Au; Cu
Ore minerals argentiferous galena; chalcopyrite; gold; pyrite; sphalerite
Gangue minerals quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale CA
Quadrangle map, 1:63,360-scale B-5
Latitude 65.461
Longitude -161.398
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 1,450 feet at the southeast end of Weather Ridge. This site is in section 28, T. 1 N., R. 13 W., of the Kateel River Meridian. The location is accurate to within 0.3 mile radius. Cobb, 1972 (MF-389), location 11; Miller and Elliott (1969), sample location 34, figure 2.

Geologic setting

Geologic description

This occurrence is located adjacent to the mid-Cretaceous Quartz Creek pluton, a hook-shaped, quartz monzonite body. The pluton is surrounded by a N 15 W-trending alteration zone about 18 miles long and 2 to 5 miles wide. The alteration zone is in Jurassic-Cretaceous andesitic volcanic rocks and is marked by quartz veins and possibly tourmaline. Fine-grained dikes of varying composition cut the andesites near the pluton. Dikes near the Quartz Creek pluton are locally mineralized. At this occurrence, galena, sphalerite, and pyrite are disseminated in quartz veins cutting altered andesite. A sample of a sulfide-bearing quartz vein (Miller and Elliott, 1969, location 34) contained: 150 ppm Ag (4.35 ounces Ag per ton), greater than 2% Pb, greater than 1% Zn, trace Au, and 500 ppm Cu.
Geologic map unit (-161.400642271252, 65.4603246991619)
Mineral deposit model Sulfides in altered andesite.
Age of mineralization Mid-Cretaceous or younger.
Alteration of deposit Quartz and tourmaline?

Production and reserves

Workings or exploration The area was first identified and mapped by the U.S. Geological Survey in the late 1960s (Miller and Elliott, 1969). It subsequently has been examined by various exploration companies. In the mid 1970s an exploration program including some drilling was completed by Greatland Exploration, Anchorage, Alaska.
Indication of production None

Additional comments

This site is one of numerous occurrences of argentiferous galena, sphalerite, pyrite, and arsenopyrite in an 18-mile-long, 2- to 5-mile-wide altered zone in andesite surrounding the hook-shaped Quartz Creek quartz monzonite pluton. The alteration zone extends N 15 W across the drainage basins of Quartz Creek and the Kiwalik River.

References