Unnamed Occurrence (ARDF - MH275; on divide between Chistochina Glacier and West Fork Chistochina glacier), Chistochina Mining District, Southeast Fairbanks Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
63° 12' 56'' North , 144° 53' 31'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: The occurrence is on a steep ridge west-northwest of peak 5990. It is in the NW1/4NW1/4 of section 4, T. 20 S., R. 15 E., Fairbanks Meridian. The occurrence corresponds to locality 15 on figure 1 of Rose (1967) and locality 6 on figure 6 of Cobb (1979 [OFR 79-238]). The location is probably accurate within 1,000 feet.
Geology: The rocks in the vicinity of this occurrence consist of metabasalts of the Nikolai Greenstone of Late Triassic age (Nokleberg and others, 1991); earlier the rocks were mapped as Mankomen Formation (Rose, 1967). A pyritic unit of the Nikolai Greenstone extends for more than a mile along strike; it is cut by intermediate and mafic dike rocks. The pyritized rock possibly contains a trace of chalcopyrite. Grab sample 6E534 contained 0.02 ounce of gold per ton, 0.18 ounce of silver per ton, and a trace of copper (Rose, 1967, table 5).
Workings: Geologic mapping; limited surface sampling.
Age: Post-Late Triassic, on the basis of the age of host rocks.
Alteration: Sulfidization of metabasalt.
Commodities (Major) - Au; (Minor) - Ag, Cu
Development Status: No
Deposit Model: Basaltic Cu (Cox and Singer, 1986; model 23).
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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite ? | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | MH275 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- North America PlatformPassive Margin
- Windy-McKinley DomainDomain
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