Unnamed (near Red Mountain Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Other commodities Zn
Ore minerals gold
Gangue minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale HU
Quadrangle map, 1:63,360-scale B-2
Latitude 66.2969
Longitude -153.8916
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on the north side of Koyukuk River, about 0.5 mile north-northwest of the junction of Red Mountain Creek and Koyukuk River. The occurrence is at an elevation of about 750 feet, 0.2 mile east-northeast of the center of section 2, T. 10 N., R. 23 E. of the Kateel River Meridian. The location is accurate within one-half mile.

Geologic setting

Geologic description

This occurrence is marked by a prominent gossan in a small, hypabyssal intrusion of Cretaceous(?) latite porphyry (Patton and Miller, 1966). The porphyry contains disseminated pyrite. Samples contained trace amounts of gold, zinc, and other metals (Patton and Miller, 1966). The latite porphyry intrudes Cretaceous graywacke and mudstone. Samples of latite porphyry, quartzite, and slate collected by Kurtak and others (1999) do not contain anomalous gold or other metals.
Geologic map unit (-153.894240193133, 66.2963721990455)
Age of mineralization Patton and Miller (1966) suggest that the latite porphyry is Cretaceous.
Alteration of deposit Gossan formed by oxidation of disseminated pyrite.

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None

References

MRDS Number A015581

References

Bottge, R.G., 1988, Maps summarizing land availability for mineral exploration and development in western Alaska, 1986: U.S. Bureau of Mines Open-File Report 14-88, 38 quadrangle overlays.
Reporters J.M. Britton (Anchorage)
Last report date 8/1/2002