Unnamed Occurrence (ARDF - SM041; on hill 1220), Aniak Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - SM041; on hill 1220) | - not defined - |
| Aniak Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 36' 55'' North , 158° 4' 58'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Crooked Creek | 105 (2016) | 28.3km |
Location: This occurrence is on hill 1220, about 6 miles south of the Oskawalik River in an area of subdued topography. The occurrence is abut 0.4 mile south-southwest of the center of section 25, T. 18 N., R. 49 W., of the Seward Meridian. The location is accurate.
Geology: This rocks at this occurrence consist of an east-west-trending, altered mafic dike that cuts hornfels of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; M.L. Miller, unpublished field data, 1999). Quartz veins radiate away from the dike into the hornfels. The hornfels contains thin seams of fine-grained pyrite. The occurrence is on the southwest edge of a large, prominent, but poorly understood circular feature that extends over the north-central Sleetmute C-6 quadrangle south of the Oskawalik River (T.K. Bundtzen, unpublished field data, 1999). Isolated bodies of intrusive rocks and hornfels occur in the circular feature. The layered rocks appear to dip outward around this circular feature. One grab sample of quartz vein and hornfels contained 298 parts per billion (ppb) gold, 3,800 ppb silver, 230 parts per million (ppm) arsenic, 76 ppm antimony, 4.0 ppm cadmium, 39 ppm cobalt, 166 ppm chromium, and 211 ppm nickel. The elevated cobalt, chromium, and nickel values probably probably reflect background values in a nearby altered, mafic dike.
Workings: The U.S. Geological Survey sampled the site in 1999.
Alteration: Silicification of hornfels.
Commodities (Major) - Ag, Au; (Minor) - As, Cd, Co, Cr, Ni, Sb
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: | SM041 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Koyukuk ArcsVolcanic Arc
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