Unnamed (headwaters of Quartz Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Zn
Other commodities Cu
Ore minerals arsenopyrite; chalcopyrite; galena; pyrite; sphalerite
Gangue minerals calcite; quartz; tourmaline

Geographic location

Quadrangle map, 1:250,000-scale CA
Quadrangle map, 1:63,360-scale B-5
Latitude 65.49
Longitude -161.39
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 800 feet near the headwaters of Quartz Creek. The site is in section 25, T. 1 N., R. 13 W., of the Kateel River Meridian. Cobb, 1972 (MF-389), location 10, and Miller and Elliott (1969), figure 2, sample locations 24, 25, and 26.

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 carbonate-quartz replacement, and tourmaline. Fine-grained dikes of varying composition cut the andesites near the pluton. Dikes near the Quartz Creek pluton are locally mineralized. This occurrence consists of a galena-bearing calcite vein 18 inches thick in altered quartz monzonite. The altered quartz monzonite consists of quartz-carbonate-sericite rock containing disseminated pyrite, arsenopyrite, galena, sphalerite, and tourmaline. A composite grab sample contained 44 ppm Ag, 2.25% Pb, and 4.67% Zn (Miller and Elliott, 1969).
Geologic map unit (-161.392644575771, 65.4893257855244)
Mineral deposit model Sulfides in altered quartz monzonite.
Age of mineralization Late Cretaceous.
Alteration of deposit Tourmaline and sericite alteration along closely spaced fractures; quartz-carbonate replacement.

Production and reserves

Workings or exploration The area has been mapped and examined by the U.S. Geological Survey and by various exploration companies.
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 zone of altered andesite surrounding the Quartz Creek quartz monzonite pluton. The altered zone trends N 15 W, across the drainage basins of Quartz Creek and the Kiwalik River, parallel to prominent lineaments in the area.

References