Unnamed Occurrence (ARDF - SM040; near hill 2370 northeast of Aghaluk Mountain), Aniak Mining District, Bethel Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
61° 32' 52'' North , 158° 10' 40'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Crooked Creek | 105 (2016) | 36.0km |
Location: This occurrence is in a saddle about 0.3 mile northeast of hill 2370, about 2.9 miles east-northeast of Aghaluk Mountain. It is at an elevation of about 2,000 feet, about 0.3 mile west-southwest of the center of section 21, T. 17 N., R. 50 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of pyrite-bearing hornfels, quartz veins in hornfels, and disseminated pyrite in a felsic intrusion. The felsic dike intrudes sandstone and shale of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; M. L. Miller, unpublished field data, 1999). The rocks strikes N44E and dips 50SE. One grab sample of the pyrite-bearing hornfels contained 800 parts per billion (ppb) silver, 4.07 parts per million (ppm) cadmium, 246 ppm copper, 128 ppm lead, 13.1 ppm molybdenum, and 214 ppm zinc (M.L. Miller, unpublished analytical data, 1999).
Workings: The U.S. Geological Survey investigated the site in 1999.
Age: Unknown. The nearby Aghaluk Mountain granite porphyry intrusion and dike swarm has a 40Ar/39Ar age of 71.2 Ma (Bundtzen and others, 1998).
Alteration: Sericitic alteration in felsic dike.
Commodities (Major) - Ag, Cu; (Minor) - Mo, Pb, Sb, Zn
Development Status: None
Deposit Model: Polymetallic vein? (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
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 |
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: | SM040 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Koyukuk ArcsVolcanic Arc
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