Unnamed (near Siwash Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals azurite; copper sulfides; malachite

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale A-5
Latitude 67.1198
Longitude -149.4035
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is about 4.1 miles east of the junction of Siwash Creek and Mosquito Fork, at an elevation of about 2,300 feet. It is about 0.3 mile southwest of the center of section 3, T. 27 N., R. 8 W.. The location is accurate to within 1 mile.

Geologic setting

Geologic description

This occurrence was originally described as copper sulfides and copper stains in a small body of chert in Devonian(?) volcanic rocks (Brosgé and Reiser, 1964; DeYoung, 1978). Kurtak and others (2002) describe a bluff about 30 feet high and 100 feet wide of highly silicified pyroxene diorite. The diorite is cut by several quartz veins 1 to 2 inches thick. Analyses of two samples of pyrite-bearing quartz and a sample of the mafic rock did not show any significant base or precious metals.
Geologic map unit (-149.406206087977, 67.1193813215111)
Mineral deposit model Insufficient information to assign.
Age of mineralization Insufficient information to assign.

Production and reserves

Workings or exploration Limited sampling by government agencies.
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

See also: West Fork occurrence (CH001).
MAS No. 0020310077