Unnamed (west of Powell Gulch)

Occurrence, Inactive

Commodities and mineralogy

Other commodities Fe
Ore minerals hematite; magnetite; pyrite
Gangue minerals chlorite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-2
Latitude 63.1548
Longitude -144.85
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is on the east-facing slope above upper Powell Gulch at an elevation of about 5,250 feet. It is about 0.2 mile north of the center of section 27, T. 20 S., R. 15 E., Fairbanks Meridian. The occurrence corresponds to locality 26 of Rose (1967). The location is probably accurate within 0.2 mile.

Geologic setting

Geologic description

The rocks that crop out just above this occurrence are pyritized and are mainly andesite of probable Pennsylvanian age. Boulders below the outcrop are mainly composed of hematite, magnetite, pyrite, and chlorite; they are probably nearly in place, but no source was found (Rose, 1967). No sample was analyzed.
Geologic map unit (-144.852226170184, 63.1544021145567)
Mineral deposit model Fe skarn? (Cox and Singer, 1986; model 18d?).
Mineral deposit model number 18d?
Age of mineralization Uncertain; epigenetic mineralization of Pennsylvanian volcanic rocks.
Alteration of deposit Pyritization; introduction of magnetite, hematite, and chlorite.

Production and reserves

Workings or exploration There are no workings at this site.
Indication of production None

References

References

Reporters W.T. Ellis (Alaska Earth Sciences), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date 7/9/2003