Unnamed Occurrence (ARDF - SE008; south of Selawik Lake), Selawik Mining District, Northwest Arctic Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - SE008; south of Selawik Lake) | - not defined - |
| Selawik Mining District | Mining District |
| Northwest Arctic Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
66° 20' 24'' North , 160° 22' 48'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Selawik | 859 (2017) | 33.7km |
Location: The occurrence is at an elevation of about 1,300 feet on hill 1378, about 3 miles south of the southeast end of Selawik Lake. The site is in section 21, T. 11 N., R. 8 W., of the Kanteel River Meridian. Barker (1985), anomalous area 2, location O.
Geology: The country rocks in the area of this occurrence consist of the mid-Cretaceous Selawik lake and Inland Lake alkaline intrusive complexes. There are three types of radioactive occurrences in the Selawik Lake complex: quartz veins associated with a fault zone; lamprophyre dikes; and radioactive zones in nephline syenite. According to Barker (1985), at location O, boulders of medium-grained syenite displayed up to 4 times the background radioactivity. Chip sample 4R contained 123 ppm U3O8 and 380 ppm Th. Pronounced metamict halos surrounding zircon grains in biotite suggest that at least some of the radioactive material is in the zircon. A fine-grained syenite intermixed with rubble at this location contained 36 ppm U3O8 and 91 ppm Th.
Workings: The area was visited by U.S. Geological Survey geologists and the U.S. Bureau of Mines. Several rock and stream sediment samples were collected from the area.
Age: Cretaceous.
Commodities (Major) - Th, U
Development Status: None
Deposit Model: Radioactive occurrences in syenite and nepheline syenite.
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 9 - Silicates | |||
|---|---|---|---|
| ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Zircon | Zr(SiO4) |
| Si | Silicon | |
| Si | ⓘ Zircon | Zr(SiO4) |
| Zr | Zirconium | |
| Zr | ⓘ Zircon | Zr(SiO4) |
Other Databases
| Link to USGS - Alaska: | SE008 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Koyukuk-Selawik DomainDomain
- Koyukuk ArcsVolcanic Arc
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