HET

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Pb; Zn
Other commodities Cu
Ore minerals galena; pyrite; sphalerite
Gangue minerals limonite

Geographic location

Quadrangle map, 1:250,000-scale BT
Quadrangle map, 1:63,360-scale B-1
Latitude 66.4923
Longitude -150.2012
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located on a bluff on the west side of the upper Kanuti River, about 9.5 miles northeast of Olsons Lake. It is at an elevation of about 2,200 feet, near the center of the NW1/4 section 7, T. 19 N., R. 12 W., of the Fairbanks Meridian. The location is accurate within one-half mile.

Geologic setting

Geologic description

This occurrence consists of small grains of galena and sphalerite disseminated in a pyritiferous gossan zone (Patton and Miller, 1970). The gossan zone is about 100 yards long and occurs in silicified and sericitized lower Tertiary(?) rhyolite tuff and tuff breccia. The rhyolite lies on, and possibly intrudes, Cretaceous, biotite quartz monzonite of the Kanuti pluton. Scattered pendants of hornfelsed schist occur in the quartz monzonite. Grab samples from the gossan zone contain as much as 20,000 ppm lead, 3,000 ppm zinc, 30 ppm silver, and 500 ppm copper. Lead values are higher at the north end of the zone; zinc and copper values predominate at the south end.
Geologic map unit (-150.203842892997, 66.4918502321666)
Alteration of deposit Pyritiferous zone extensively oxidized to limonite. Rhyolite host is silicified and sericitized.

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None

Additional comments

Examination of deposit was brief and exposures are poor (Patton and Miller, 1970).

References