Unnamed (southwest of Slate Creek)

Occurrences, Inactive

Commodities and mineralogy

Main commodities Fe
Ore minerals hematite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale A-2
Latitude 63.1591
Longitude -144.8768
Nearby scientific data Find additional scientific data near this location
Location and accuracy These occurrences are at the approximate center of localities 28 and 29 on figure 1 of Rose (1967). The location is at an elevation of about 4,400 feet in the NW1/4NE1/4 section 28, T. 20 S., R. 15 E., Fairbanks Meridian. Rose's locality 29 is a few hundred feet west-northwest of the location; his locality 28 is a few hundred feet east-southeast of it.

Geologic setting

Geologic description

Rocks in the vicinity of these occurrences consist of andesite and dacite agglomerate, tuff, and flows of Pennsylvanian to Permian (?) age (Rose, 1967). Boulders of hematite and hematite-pyrite were found at two main sites on a steep side hill, and the source of the boulders is probably subjacent to or just above the talus.
Andesite and dacite near the site have been extensively pyritized, possibly by nearby intrusions of Mesozoic age. The boulders are possibly from a contact-metamorphic type of iron deposit. Iron-rich deposits nearby locally contain copper (about one half mile to the southeast).
Geologic map unit (-144.879025512779, 63.1587014588524)
Mineral deposit model Fe skarn? (Cox and Singer, 1986; model 18d?).
Mineral deposit model number 18d?
Age of mineralization Mesozoic (?), inferred from nearby plutons of that age.
Alteration of deposit Replacement of intermediate volcanic rocks by iron minerals.

Production and reserves

Workings or exploration Only geologic mapping and surface prospecting.
Indication of production None

References

References

Reporters W.T. Ellis (Alaska Earth Sciences) and C.C Hawley (Hawley Resource Group)
Last report date 6/24/2003