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Unnamed Occurrence (ARDF - MH286; northwest of the terminus of Chistochina Glacier), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 11' 59'' North , 144° 52' 33'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is on a ridge on the northwest side of the terminus of the Chistochina Glacier at an elevation of about 5,700 feet. It is near the center of the W1/2NE1/4 section 9, T. 20 S., R. 15 E., Fairbanks Meridian. This corresponds to locality 19 on figure 1 of Rose (1967) and locality 10 on figure 6 of Cobb (1979 [ OFR 79-238]). It is accurate to about 0.1 mile.
Geology: The host rock at this occurrence is dunite in a composite ultramafic body that also contains peridotite, pyroxenite, and hornblendite (Rose, 1967). Thin veinlets of cross-fiber chrysotile cut the dunite. Boulders of hornblendite near the site contain as much as about 10 percent magnetite. No analyses are reported from the area.
Workings: The site was found during geologic mapping (Rose, 1967).
Age: Probably Late Triassic, related to the sillform body that hosts the occurrence.
Alteration: Alteration of the dunite has produced veinlets of cross-fiber chrysotile.
Commodities (Major) - Chrysotile; (Minor) - Fe
Development Status: No
Deposit Model: Low-grade deposit of cross-fiber asbestos (chrysotile) and disseminated magnetit
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.
Detailed Mineral List:
| ⓘ Chrysotile Formula: Mg3(Si2O5)(OH)4 |
| ⓘ Magnetite Formula: Fe2+Fe3+2O4 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
| Group 9 - Silicates | |||
| ⓘ | Chrysotile | 9.00. | Mg3(Si2O5)(OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| O | Oxygen | |
| O | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| O | ⓘ Magnetite | Fe2+Fe23+O4 |
| Mg | Magnesium | |
| Mg | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| Si | Silicon | |
| Si | ⓘ Chrysotile | Mg3(Si2O5)(OH)4 |
| Fe | Iron | |
| Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Other Databases
| Link to USGS - Alaska: | MH286 |
|---|
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