Unnamed Occurrences (ARDF - NT001; on Iyikrok Mountain), Lisburne Mining District, Northwest Arctic Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrences (ARDF - NT001; on Iyikrok Mountain) | - not defined - |
| Lisburne Mining District | Mining District |
| Northwest Arctic Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
67° 56' 57'' North , 163° 36' 43'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This site consists two large occurrences and 20 smaller occurrences spread over an area about 6 miles in diameter that makes up the highlands of Iyikrok Mountain. The coordinates are approximately the center of the mafic-ultramafic complex on Iyikrok Mountain, about 0.5 miles southwest of the center of Section 36, T. 30 N., R. 22 W., of the Kateel River Meridian.
Geology: Chromite occurs in peridotite and/or dunite of the lyikrok mafic-ultramafic complex (Foley and others, 1985.). The two larger occurrences are a banded zone about 80 by 300 feet in area with 3-4 percent chromite and a banded zone about 30 by 1,000 in area with 3 to 4 percent chromite. Lower grade material possibly extends for 3,000 feet from both occurrences. The chromite bands are generally 1 to 2 inches thick, but may be up to 8 feet thick. The chrome/iron ratios are 2.8 to 3.1. More than 20 smaller occurrences of chromite are reported but were not measured. Foley and others (1985) estimated that the zone of chromite-bearing rocks about 80 by 350 feet in area contains 5,000 to 12,000 tons of chromic oxide. The zone about 300 by 100 feet in area contains 139,000 to 371,000 tons of chromic oxide. The total estimated reserve potential is 194,000 to 383,000 tons of chromic oxide.
Workings: Surface sampling and mapping only.
Reserves: Foley and others (1985) estimated that the zone of chromite-bearing rocks about 80 by 350 feet in area contains 5,000 to 12,000 tons of chromic oxide. The zone about 300 by 100 feet in area contains 139,000 to 371,000 tons of chromic oxide. The total estimated reserve potential is 194,000 to 383,000 tons of chromic oxide.
Commodities (Major) - Cr
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
1 valid mineral.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Other Databases
| Link to USGS - Alaska: | NT001 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Brooks Range DomainVolcanic Arc
- Colville Basin and FoldbeltBasin
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