|Quadrangle map, 1:250,000-scale||IL|
|Quadrangle map, 1:63,360-scale||C-3|
|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 descriptionThis 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.|
|Workings or exploration||Berg and Cobb (1967) reported that the occurrence had been staked.|
|Indication of production||None|
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Detterman, R.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Iliamna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-364, 1 sheet, scale 1:250,000.
|Reporters||C.C. Hawley, Hawley Resource Group, Anchorage, Alaska|
|Last report date||6/6/2003|