Unnamed (north of mouth of Iliamna River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Fe
Other commodities Ti
Ore minerals magnetite

Geographic location

Quadrangle map, 1:250,000-scale IL
Quadrangle map, 1:63,360-scale C-3
Latitude 59.7374
Longitude -153.9567
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 150 feet about 0.3 mile southwest of benchmark Pile (762 elevation) and 0.5 mile north of the mouth of Iliamna River. The occurrence is near the center of the E1/2 SE1/4 sec. 13, T. 5 S., R. 28 W., Seward Meridian. The location is accurate within about 0.5 mile. The occurrence is number 27 of Detterman and Cobb (1972).

Geologic setting

Geologic description

This occurrence consists of magnetite in Jurassic mafic-ultramafic rocks that may be a roof pendant in a Jurassic quartz diorite batholith (Detterman and Reed, 1980). The mafic-ultramafic rocks consist of gabbro, hornblende gabbro, and pyroxenite. Magnetite occurs in veins, disseminations, and lenticular pods. The occurrence is large but low grade (Berg and Cobb, 1967).
Geologic map unit (-153.958859967542, 59.7367347344701)
Mineral deposit model Magnetite deposit in mafic-ultramafic igneous rock; some affinity to Alaskan PGE (Cox and Singer, 1986, model 9).
Mineral deposit model number 9
Age of mineralization Jurassic, the age of the host rock.

Production and reserves

Workings or exploration Berg and Cobb (1967) reported that the occurrence had been staked.
Indication of production None

References