| Main commodities | Th; U |
|---|---|
| Ore minerals | radioactive minerals |
| Gangue minerals | fluorite |
| Quadrangle map, 1:250,000-scale | SE |
|---|---|
| Quadrangle map, 1:63,360-scale | A-4 |
| Latitude | 66.124 |
| Longitude | -160.633 |
| Nearby scientific data | Find additional scientific data near this location |
| Location and accuracy | This prospect is at an elevation of about 950 feet in the NE1/4 section 6, T. 8 N., R. 9 W., of the Kateel River Meridian. Barker (1985), figs. 7, 8, location D. |
Geologic descriptionThe country rock in the area of this prospect is the mid-Cretaceous Selawik Hills alkaline intrusive complex. The prospect is one of several areas of anomalous radioactivity within the complex. Barker (1985) describes the following features at this site. In anomalous area 1, radioactive altered zones occur in medium-grained biotite-hornblende syenite. At location D, a north-trending ridge of hornblende syenite hosts zones of clay, chlorite, epidote and carbonate alteration. Fluorite is common as discrete grains and as fracture fillings. At sample site 25R, a rubble zone yielded radiometric levels of about 3 times background and contained 770 ppm U3O8 and 4,957 ppm Th. An unidentified red, waxy mineral accounted for 5% to 10% of the rock. | |
| Geologic map unit | (-160.635711175078, 66.1233509006142) |
|---|---|
| Mineral deposit model | Disseminated radioactive minerals in syenite. |
| Age of mineralization | Cretaceous. |
| Alteration of deposit | Clay, chlorite, epidote, and carbonate alteration. |
| Workings or exploration | Shallow prospect pits and a core drill hole, probably dating from the 1950s, were found in the vicinity of the prospect (Barker, 1985). Samples and preliminary mapping was done by U.S. Bureau of Mines in early 1980s. |
|---|---|
| Indication of production | None |
| MRDS Number | A013505 |
|---|---|
References | |
| Reporters | Anita Williams (Anchorage, AK) |
| Last report date | 12/2/1999 |