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Unnamed Occurrences (ARDF - SP025; northwest of Takahula River), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrences (ARDF - SP025; northwest of Takahula 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° 21' 36'' North , 153° 59' 24'' West
Latitude & Longitude (decimal):
Köppen climate type:
Located within Gates of the Arctic National Park.
Location: The site represents two occurrences in a northeast-trending, two-mile-long area, about 2.5 miles northwest of the Takakula River. The approximate center of the area is in the NW1/4 of sec. 33, T. 23 N., R. 22 E., of the Kateel River Meridian. The location is accurate to within 2000 ft. The site corresponds to localities 50 and 51 of Grybeck and Nelson (1981).
Geology: Both occurrences are in or adjacent to Devonian granite near the contact with Paleozoic rocks (Nelson and Grybeck, 1980). The occurrences consist of a grab sample of black phyllite about 100 m from altered granite and several samples of marble, calc-silicate rocks, and gneissic granite. Selected samples contain 200 ppm Be, 30 and 50 ppm Bi, 20 ppm Mo, 100 and 5000 ppm Sn, and 700 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: Contact metamorphic.
Commodities (Major) - Sn, Zn; (Minor) - Be, Bi, Mo
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: | SP025 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Brooks RangeMountain Range
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Brooks Range DomainVolcanic Arc
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