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Unnamed Occurrence (ARDF - MG017; near Cheeneetnuk River), Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MG017; near Cheeneetnuk River) | - not defined - |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 2' 2'' North , 155° 13' 40'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This unnamed occurrence is located on a north-south ridgeline, 3.0 kilometers NW of Cheeneetnuk River, at an elevation of 2,500 feet (762 m) in the SE1/4 sec. 36, T. 23 N., R. 33 W., of the Seward Meridian. The location corresponds to map number 136 of Gilbert (1981); his station no. 77WG236. The reporter visited the site in 1989.
Geology: This unnamed occurrence is a pyrite-rich gossan developed in Upper Paleozoic argillite of the Mystic subterrane near a thrusted contact with an overlying, Late Devonian shallow water limestone (Gilbert, 1981; Wilson and others, 1998). The pyritic gossan parallels the thrust contact and may mark a subsidiary thrust fault zone. The argillite host appears to be thermally upgraded to hornfels by a buried intrusive system; a Tertiary granite is exposed about 5 kilometers NE of the occurrence area. Platey axinite and quartz were found in two localities in the argillite. The extent of the site is unknown. One grab sample of the pyritic material contained 290 ppm copper, 150 ppm zinc, and 7 ppm molydenum (Gilbert, 1981).
Workings: W.G. Gilbert sampled the mineralized zone during geologic mapping for the Alaska Division of Geological and Geophysical Surveys in 1977 (Gilbert, 1981). One grab sample of the pyritic material yielded 290 ppm copper, 150 ppm zinc, and 7 ppm molybdenum.
Reserves: None.
Commodities (Major) - Cu; (Minor) - Mo, Zn
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
2 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Unclassified | |||
| ⓘ | 'Axinite Group' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | MG017 |
|---|
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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