Unnamed Occurrence (ARDF - MG018; on tributary of Cheeneetnuk River), Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MG018; on tributary of Cheeneetnuk River) | - not defined - |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 3' 54'' North , 155° 12' 25'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This unnamed occurrence is located on a north-south ridgeline overlooking an unnamed tributary of Cheeneetnuk River; it is at an elevation of 2,475 feet (754 m) in the SE1/4 sec. 19, T. 23 N., R. 32 W., of the Seward Meridian. The location corresponds to map number 138 in Gilbert (1981); his station no. 77WG203. The reporter visited the site in 1989.
Geology: This unnamed occurrence is a sulfide gossan hosted in Upper Paleozoic argillite of the Mystic subterrane, adjacent to a Tertiary andesite dike (Gilbert, 1981; Wilson and others, 1998). The gossan trends northeast for 90 meters and may be related to the dike. Pyrite impregnates ferricrete gossan in one sample; otherwise sulfide minerals have been completely oxidized. The argillite is locally thermally upgraded to hornfels; axinite and secondary biotite are observed in talus and rubble crop. A mid-Tertiary (39.8 Ma) granite pluton (Solie and others, 1991) is exposed in low angle contact with the Upper Paleozoic argillite and probably underlies the ridge where the mineralization occurs. Surface dimensions of the gossan are not available. One grab sample of gossan contained 350 ppm copper and 0.3 grams/tonne silver (Gilbert, 1981).
Workings: W.G. Gilbert found the occurrence during a geologic mapping program for the Alaska Division of Geological and Geophysical Surveys in 1977 (Gilbert, 1981). One grab sample of gossan contained 350 ppm copper and 0.3 grams/tonne silver (Gilbert, 1981).
Age: Unknown; possibly related to 39.8 Ma granite body nearby (Gilbert, 1981; Solie and others, 1991).
Alteration: Axinite, secondary biotite.
Reserves: None.
Commodities (Major) - Cu; (Minor) - Ag
Development Status: No
Deposit Model: Polymetallic replacement (?) (Cox and Singer, 1986; model 19a).
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 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
Other Databases
| Link to USGS - Alaska: | MG018 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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