Big Joe Creek

Occurrence, Inactive

Commodities and mineralogy

Main commodities Au
Ore minerals gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CH
Quadrangle map, 1:63,360-scale B-3
Latitude 67.46
Longitude -148.31
Nearby scientific data Find additional scientific data near this location
Location and accuracy The site is located at an elevation of about 3,800 ft approximately 5 3/4 miles southeast of Chandalar near the head of Big Joe Creek, a tributary to Big Creek (sec. 31, T. 31 N., R. 3 W., of the Fairbanks Meridian). The location is approximated from loc. 8 in DeYoung (1978). The location is accurate within a 1-mile radius.

Geologic setting

Geologic description

The prospect is described only as gold in a quartz vein (Brosgé and Reiser, 1972) in an area mapped as Devonian(?) black, fine-grained quartz-muscovite-chlorite schist with intercalated Devonian(?) green, schistose hornblende diorite and pyroxene diorite sills and andesitic flows(?) (Brosgé and Reiser, 1964). A rock sample from this occurrence contained 0.04 to 0.079 ppm Au. No other descriptive information is available for this occurrence.
Geologic map unit (-148.312722897058, 67.4596121600108)
Mineral deposit model Low-sulfide Au-quartz veins? (Cox and Singer, 1986; model 36a?).
Mineral deposit model number 36a?
Age of mineralization Middle Cretaceous(?) based on arguments by Dillon (1982) that the age of emplacement of the gold-bearing quartz veins of the Koyukuk and Chandalar districts was between the Neocomian metamorphism of the Devonian host rocks and their erosional unroofing and cooling in Albian time.

Production and reserves

Workings or exploration No information available.
Indication of production None