Roches Moutonnees

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Zn
Ore minerals bornite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale B-1
Latitude 67.3808
Longitude -150.162
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the west side of the Middle Fork, Koyukuk River about 0.5 mile northwest of the mouth of Moose Creek. It is at an elevation of about 1,530 feet, 0.1 mile south of the center of section 35, T. 30 N., R. 12 W., of the Fairbanks Meridian. The name, Roches Moutonnees, is derived from the rounded hummock outcrops in the area, which are said to form a distinctive local feature. The location is accurate within one-half mile.

Geologic setting

Geologic description

This occurrence consists of quartz veinlets in dolomite and limestone (Mulligan, 1974). Analysis of the veinlets show trace amounts of copper and zinc, but the only visible sulfide in freshly broken quartz was a small bleb of bornite. The rocks in the area are Proterozoic or lower Paleozoic(?), calcareous schist, and local marble (Dillon and others, 1986).
Geologic map unit (-150.164740084338, 67.380371835904)

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None