Unnamed (in Ptarmigan Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Mo
Other commodities Ag
Ore minerals molybdenite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale D-6
Latitude 63.8094
Longitude -146.5256
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the north side of the canyon of Ptarmigan Creek just above where the creek enters the flood plain of Delta Creek. The prospect is about 2,000 feet north of the center of section 11, T. 13 S., R 6 E., Fairbanks Meridian. It is probably accurately located within one-third of a mile. The site corresponds to locality N2 in table 2 of Nokleberg and others (1991).

Geologic setting

Geologic description

This unnamed prospect is in Cretaceous granodiorite at or near the contact of the granodiorite with quartz schist (Nokleberg and Aleinikoff, 1985; Nokleberg and others, 1991). At the prospect site iron-stained rock contains pyrite and molybdenite(?). Grab sample 80IL003B-E contained 70 parts per million (ppm) molybdenum and 5 ppm silver (Nokleberg and others, 1991). The prospect is almost certainly related geologically to the nearby Ptarmigan Creek prospects (MH003).
Geologic map unit (-146.527904255247, 63.8089886954109)
Mineral deposit model Porphyry Mo (Cox and Singer, 1986; model 21b).
Mineral deposit model number 21b
Age of mineralization The deposit is probably related to the emplacement of the Cretaceous granodiorite host rock.
Alteration of deposit The granodiorite exhibits local oxidation.

Production and reserves

Workings or exploration Minor prospecting of uncertain date; reconnaissance sampling by the U.S. Geological Survey indicated as much as 70 parts per million (ppm) molybdenum and 5 ppm silver (Nokleberg and others, 1991).
Indication of production None

References

References

Nokleberg, W.J., and Aleinikoff, J.N., 1985, Summary of stratigraphy, structure, and metamorphism of Devonian igneous-arc terranes, northeastern Mount Hayes quadrangle, eastern Alaska Range, IN Bartsch-Winkler, Susan, ed., The United States Geological Survey in Alaska--Accomplishments during 1984: U.S. Geological Survey Circular 967, p. 66-71.
Reporters W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)
Last report date 6/10/2001