Unnamed (west of the upper West Fork Maclaren River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag
Other commodities Cu; Mo
Ore minerals malachite; pyrite
Gangue minerals quartz; white mica

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-6
Latitude 63.3194
Longitude -146.7712
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 5,500 feet on the ridge between a major west tributary to the West Fork and the West Fork Maclaren River and about one-quarter mile west-northwest of peak 6222, near the common corner of sections 27, 28, 33, and 34, T. 19 S., R. 5 E., Fairbanks Meridian. The site corresponds to locality 20 in table 2 of Nokleberg and others (1991). The location is probably accurate within one-half mile.

Geologic setting

Geologic description

The rock near the occurrence consists of white mica phyllite of the Maclaren Glacier metamorphic belt (Nokleberg and others, 1982). The phyllite is pyritic and in places stained with malachite. Copper was not detected in one sample that, however, contained 7 parts per million (ppm) silver and 50 ppm molybdenum (Nokleberg and others, 1991, locality 20, table 2).
Geologic map unit (-146.77347128001, 63.3189635824309)
Age of mineralization Possibly syngenetic to protolith of white mica (sericite?) in phyllite.
Alteration of deposit Oxidation of iron- and copper-bearing minerals.

Production and reserves

Workings or exploration There are no workings. The occurrence was found during regional mapping and sampling (Nokleberg and others, 1991).
Indication of production None