Unnamed Occurrence (ARDF - IL021; north of mouth of Iliamna River), Bristol Bay Mining District, Lake and Peninsula Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
59° 44' 14'' North , 153° 57' 25'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Port Alsworth | 159 (2017) | 55.4km |
Location: 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).
Geology: 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).
Workings: Berg and Cobb (1967) reported that the occurrence had been staked.
Age: Jurassic, the age of the host rock.
Commodities (Major) - Fe; (Minor) - Ti
Development Status: None
Deposit Model: Magnetite deposit in mafic-ultramafic igneous rock; some affinity to Alaskan PG
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
1 valid mineral.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| Fe | Iron | |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Other Databases
| Link to USGS - Alaska: | IL021 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Peninsular-Iliamna DomainDomain
- Peninsular TerraneVolcanic Arc
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