Unnamed Occurrences (ARDF - SP027; near head of Kobuk River), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrences (ARDF - SP027; near head of Kobuk River) | - not defined - |
| Koyukuk Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
67° 18' 36'' North , 154° 1' 12'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
202065
Long-form identifier:
mindat:1:2:202065:8
GUID (UUID V4):
55502470-0508-430a-b754-7767f570f66a
Located within Gates of the Arctic National Park.
Location: This site represents two occurrences in a north-trneding, mile-long area near the head of the Kobuk River. The center of the area is in the N1/2 of sec. 17, T. 22 N., R. 22 E., of the Kateel River Meridian. The location is accurate to within 2000 ft. The site corresponds to localities 53 and 54 of Grybeck and Nelson (1981).
Geology: The occurrences consist of small skarn deposits adjacent to Devonian granite and Paleozoic metamorphic rocks (Nelson and Grybeck, 1980). Selected float samples contain 200 ppm Be, 200 to 500 ppm Bi, 500 ppm W, 1000 ppm Sn, and 500 to 2000 ppm Zn. The occurrences are similar to other skarn deposits in the Brooks Range (Newberry and others, 1986).
Age: Devonian; related to the intrusion of Devonian pluton.
Alteration: Calc-silicate minerals.
Commodities (Major) - Sn, W, Zn; (Minor) - Be, Bi
Development Status: None
Deposit Model: Skarn (Cox and Singer, 1986; model 14b)
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: | SP027 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Brooks RangeMountain Range
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Brooks Range DomainDomain
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References
