Unnamed Occurrence (ARDF - MG007; along Kuskokwim River), Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - MG007; along Kuskokwim River) | - not defined - |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 53' 16'' North , 155° 35' 16'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| McGrath | 344 (2017) | 7.6km |
Location: The unnamed occurrence is located along the banks of the Kuskokwim River about 8 kilometers due south of McGrath, Alaska and 1.5 kilometers due south of VABM About, at an elevation of about 400 feet (120 m) in the SE1/4 sec. 2, T. 32 N., R. 34 W., of the Seward Meridian. The occurrence corresponds to prospect #1 of Cobb (1972) and prospect #13 of Bundtzen and Laird (1983; field no. 77BT230).
Geology: This occurrence consists of pyrite-pyrrhotite nodules in highly deformed, sheared shale and siltstone of the Late Cretaceous Kuskokwim Group (Bundtzen and Laird, 1983). Individual sulfide nodules average about 8 centimeters in diameter, and are locally oxidized to ferricrete gossan. The sulfide bearing zone, which appears to be parallel to steeply dipping bedding in the host sedimentary rocks, is about 3 meters thick. The sulfide zone quickly extends upward into the vegetated slopes (Bundtzen and Laird, 1983). Cobb (1972) and Brooks and Martin (1921) refer to the occurrence as an unnamed, copper-nickel lode. A selected grab sample reported by Bundtzen and Laird (1983) contains 12.26 grams/tonne silver, 116 ppm copper, 167 ppm lead, and 139 ppm nickel.
Workings: Brooks and Martin (1921) first mentioned the existence of sulfide mineralization at the site. A selected grab sample reported by Bundtzen and Laird (1983) contains 12.26 grams/tonne silver, 116 ppm copper, 167 ppm lead, and 139 ppm nickel.
Alteration: Ferricrete oxidation of pyrite and pyrrhotite.
Reserves: None.
Commodities (Major) - Ag, Cu, Pb; (Minor) - Ni
Development Status: No
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c).
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 | |||
|---|---|---|---|
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | 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 | ⓘ Pyrite | FeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
Other Databases
| Link to USGS - Alaska: | MG007 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Farewell TerranePassive Margin
- Minchumina BasinBasin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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