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Unnamed Occurrences (ARDF - NT007; on Asik Mountain), Noatak Mining District, Northwest Arctic Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrences (ARDF - NT007; on Asik Mountain) | - not defined - |
| Noatak Mining District | Mining District |
| Northwest Arctic Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
67° 27' 0'' North , 162° 25' 1'' West
Latitude & Longitude (decimal):
Köppen climate type:
The occurrence is now within the Noatak National Preserve which is closed to exploration and mining.
Location: The main occurrence is about 2.0 miles southwest of the summit of Asik Mountain near hill 1370. A second, more minor occurrence is near the top of Asik Mountain. The main occurrence is near the center of Section 27, T. 23 N., R. 16 W., of the Kateel River Meridian. The occurrences are accurate to within one mile.
Geology: Disseminated chromite and magnetite occur widely in dunite of the ultramafic body at Asik Mountain (Degenhart and others, 1978). The body has poorly defined layering. The structure in the area is complex, but generally it appears that the pluton has intruded carbonate rocks of Paleozoic, possibly Devonian, age. The contact appears to be nearly conformable, suggesting that the intrusive may be sill-like. The dunite often contains up to 2 percent disseminated chromite and analyses of samples show contain minor amounts of copper, nickel, and platinum-group elements. Two anomalous areas of chromium on Asik Mountain were outlined by soil samples; samples from these areas contained more than 600 parts per million (ppm) chromium and 450 ppm nickel (versus background values of less than 200 ppm chromium and 100 ppm nickel). Degenhart and others (1978) collected one sample of pyritic syenodiorite on the west side of Asik Mountain that contained more than 500 ppm copper (Degenhart and others, 1978). They also describe a 'modest buildup of chromium and nickel' in tan to brown weathered dunite near the southwestern part of Asik Mountain and a 'lesser chromium buildup' associated with peridotite at the peak of Asik Mountain.
Workings: Limited surface and soil sampling in the late 1970's.
Reserves: None.
Commodities (Major) - Cr, Fe; (Minor) - Cu, Ni, Pt-group
Development Status: None
Deposit Model: Podiform chromite (Cox and Singer, 1986; model 8a).
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
2 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Other Databases
| Link to USGS - Alaska: | NT007 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Brooks Range DomainVolcanic Arc
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