Little Susitna River

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; W
Ore minerals chalcopyrite; magnetite; pyrite; scheelite

Geographic location

Quadrangle map, 1:250,000-scale AN
Quadrangle map, 1:63,360-scale D-6
Latitude 61.79
Longitude -149.14
Nearby scientific data Find additional scientific data near this location
Location and accuracy Multiple occurrences along upper reaches of Little Susitna River, centered near VABM Creek. Accurate within 1.5 miles upstream and downstream from plotted point. Locality 77-84 of Cobb (1972).

Geologic setting

Geologic description

Concentrate samples in stream gravels contain a few grains of scheelite and chalcopyrite (Jasper, 1967). Assays yielded up to 110 ppm Cu and 5 ppm Mo (Jasper, 1967). Nearby crystalline rocks include Tertiary to Cretaceous biotite-hornblende tonalite, and Jurassic amphibolite and foliated quartz diorite. Creek float dominantly quartz diorite.
Geologic map unit (-149.142205052089, 61.7894698422944)
Age of mineralization Jurassic or younger, based on ages of bedrock in the area.

Production and reserves

Workings or exploration Assays yielded up to 110 ppm Cu and 5 ppm Mo (Jasper, 1967). Other pan concentrates include magnetite, pyrite, and zircon.
Indication of production None