Unnamed Occurrence (ARDF - MH268; east of lower Gakona Glacier), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 13' 11'' North , 145° 6' 54'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation 5,300 feet approximately 2 miles east of lower Gakona Glacier. It is in the SW1/4SW1/4 section 32, T. 19 S., R. 14 E., Fairbanks Meridian.
Geology: The north-northeast-trending deposit at this site consists of steeply dipping east-west-trending Upper Triassic layered gabbro, peridotite, and pyroxenite (W.T. Ellis, oral communication, 1994). Some of the gabbro and pyroxenite are very coarse grained. A 3-foot-thick iron-stained zone that strikes north and dips 45E is serpentinized and contains disseminated to semimassive segregations of pyrite, pyrrhotite, and chalcopyrite. A grab sample of a sulfide-rich boulder contained 1,056 parts per million (ppm) copper and 102 ppm cobalt.
Workings: The prospect was discovered in 1994 by American Copper and Nickel Company (W.T. Ellis, oral communication, 1994).
Age: Late Triassic.
Alteration: Conspicuous iron-staining and moderate to strong serpentinization.
Commodities (Major) - Cu; (Minor) - Co
Development Status: None
Deposit Model: Ni-Cu-PGE in differentiated mafic-ultramafic sill.
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
3 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Pyrrhotite Formula: Fe1-xS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | MH268 |
|---|
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