Unnamed Occurrence (ARDF - MG028; overlooking Middle Fork of Kuskokwim River), Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MG028; overlooking Middle Fork of Kuskokwim River) | - not defined - |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 13' 40'' North , 154° 27' 0'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: The unnamed occurrence is located in a low saddle overlooking the Middle Fork of the Kuskokwim River at an elevation of 3,000 feet (915 m) in the SW1/4 sec. 27, T. 25 N., R. 28 W., of the Seward Meridian. The reporter visited the site in 1998 at station no. 98BT440.
Geology: This unnamed occurrence is a skarn zone developed in a highly sheared limestone of Late Triassic age, a part of the Mystic subterrane (Gilbert and others, 1988; Bundtzen, Harris, and Gilbert, 1997). Massive pyrite bands averaging 8 centimeters in thickness occur in association with epidote-quartz gangue within a 10 meter wide skarn zone near a gabbro-diorite sill. One grab sample contained 10.75 percent iron, 100 ppm molybdenum, and 1.25 grams/tonne silver (T.K. Bundtzen and G.M. Laird, written communication, 1998).
Workings: This unnamed occurrence was investigated in 1998. One grab sample contained 10.75 percent iron, 100 ppm molybdenum, and 1.25 grams/tonne silver (T.K. Bundtzen and G.M. Laird, written communication, 1998).
Reserves: None.
Commodities (Major) - Ag; (Minor) - Fe, Mo
Development Status: No
Deposit Model: Iron-rich skarn (Cox and Singer, 1986; model 18a).
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ Molybdenite Formula: MoS2 |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Molybdenite | 2.EA.30 | MoS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | Oxygen | |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Quartz | SiO2 |
| Al | Aluminium | |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Molybdenite | MoS2 |
| S | ⓘ Pyrite | FeS2 |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | Iron | |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Pyrite | FeS2 |
| Mo | Molybdenum | |
| Mo | ⓘ Molybdenite | MoS2 |
Other Databases
| Link to USGS - Alaska: | MG028 |
|---|
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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