Unnamed Occurrence (ARDF - EA031; on Calico Bluff), Eagle Mining District, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - EA031; on Calico Bluff) | - not defined - |
| Eagle Mining District | Mining District |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 54' 33'' North , 141° 11' 31'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: Calico Bluff is located on the west bank of the Yukon River about 12 miles downstream from the town of Eagle. The coordinates are the approximate center of the outcrop of the Calico Bluff Formation along the Yukon River, in the SW1/4 section 14, T. 1 N., R. 32 E., of the Fairbanks Meridian. The location is accurate. Calico Bluff is locality 11 of Eberlein and others (1977).
Geology: The Calico Bluff Formation consists of rhythmically interbedded, bioclastic limestone and dark brownish-gray shale; it is about 1,400 feet thick (Foster, 1976). The Calico Bluff Formation contains rich invertebrate fauna and a few gymnosperm pollen grains and spores; it is of Late Mississippian to Early Pennsylvanian age (Foster, 1976). In 1948, Wedow (1954) collected samples at scattered outcrops of the Calico Bluff Formation, from Calico Bluff to the Tatonduk River, during a reconnaissance for radioactive deposits in the Eagle-Nation area. Two units of black shale are slightly radioactive; both are near the base of the Calico Bluff Formation (Wedow, 1954). Selected samples that showed anomalous radioactivity in the field were assayed. They contain 0.001 to 0.005 percent uranium. A select sample of phosphatic material contains 0.019 percent uranium, and a sample of fossiliferous gray-black shale with a bluish phosphate bloom contains 0.009 percent uranium; these samples contain 0.46 and 0.68 percent V2O5, respectively (Wedow, 1954).
Workings: In 1948, Wedow (1954) collected samples at scattered outcrops of the Calico Bluff Formation, from Calico Bluff to the Tatonduk River, during a reconnaissance for radioactive deposits in the Eagle-Nation area. Two units of black shale are slightly radioactive; both are near the base of the Calico Bluff Formation (Wedow, 1954). Selected samples that showed anomalous radioactivity in the field were assayed. They contain 0.001 to 0.005 percent uranium. A select sample of phosphatic material contains 0.019 percent uranium, and a sample of fossiliferous gray-black shale with a bluish phosphate bloom contains 0.009 percent uranium; these samples contain 0.46 and 0.68 percent V2O5, respectively (Wedow, 1954).
Age: The Calico Bluff Formation is of Late Mississippian to Early Pennsylvanian age (Foster, 1976).
Commodities (Major) - U; (Minor) - V
Development Status: None
Deposit Model: Sandstone U? (Cox and Singer, 1986; model 30c).
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.List of minerals for each chemical element
Other Databases
| Link to USGS - Alaska: | EA031 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Brooks-Northslope1 DomainDomain
- Laurentia triangle DomainDomain
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