Unnamed Occurrence (ARDF - SM042; north of Oskawalik River), Aniak Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - SM042; north of Oskawalik River) | - not defined - |
| Aniak Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 41' 43'' North , 157° 45' 0'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Crooked Creek | 105 (2016) | 27.1km |
Location: This occurrence extends for about 0.6 mile along a northeast-trending ridge, north of the headwaters of the Oskawalik River. The coordinates are at about the center of the area which is at an elevation of about 1,500 feet in the NW1/4 sec. 35, T. 19 N., R. 47 W., of the Seward Meridian.
Geology: This occurrence consist of an elongate, northeast-trending area of about 0.8 square mile. The rocks in the vicinity are altered and hornfelsed sandstone and shale of the Upper Cretaceous, Kuskokwim Group. The sedimentary rocks have been intruded by felsic dikes of at least two compositions. One is tan-colored, biotite granite porphyry; the other is bleached alaskite. Both strike N60E and average about 13 feet thick; they extend along strike for about 1,600 feet. The sedimentary rocks contains quartz, ferricrete, and sulfide-bearing breccia. In the southern part of the mineralized area, a conspicuous quartz vein about 10 feet thick and 320 feet long strikes N45E, nearly parallel to the felsic dikes. The mineralization occurs as goethite-rich quartz breccias in hornfels; pyrite-bearing, quartz veins; and quartz-carbonate stockworks near the dikes. Most of the mineralization is exposed only as rubble crop and float. Twelve grab samples of quartz veins and goethite-rich quartz breccia contained up to 83 parts per billion (ppb) gold, 470 parts per million (ppm) arsenic, 390 ppb mercury, and 300 ppb silver (T.K. Bundtzen, unpublished analytical data, 1998 and 1999).
Workings: The prospect was discovered and sampled in 1998 by government geologists.
Alteration: Sericitic alteration in intrusive rocks; oxidation of breccia; hornfelsing of shale and sandstone.
Reserves: None.
Commodities (Major) - As, Au; (Minor) - Ag, Hg
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: | SM042 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Koyukuk ArcsVolcanic Arc
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