Unnamed Occurrence (ARDF - SM050; Upper Kogoyuk Creek), Aniak Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - SM050; Upper Kogoyuk Creek) | - not defined - |
| Aniak Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 20' 4'' North , 158° 30' 28'' West
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
201643
Long-form identifier:
mindat:1:2:201643:9
GUID (UUID V4):
6e96323c-2ec5-493c-9625-7dcb5885c5de
Location: This occurrence is on a steep northwest-facing knob overlooking upper Kogoyuk Creek in the northeast Buckstock Mountains. The occurrence is on hill 2147 in the NE1/4 sec. 1, T. 14 N., R. 52 W., of the Seward Meridian. The location is accurate.
Geology: This occurrence consists of quartz-sulfide veins in a sericitized porphyry dike or sill that is part of the Cretaceous Buckstock Mountains plutonic complex. The Buckstock Mountains pluton has a U-Pb age of 59.2 Ma (Miller and others, 2002). The dike or sill is one of many near the occurrence that cut hornfels of the Upper Cretaceous Kuskokwim Group (Cady and others, 1955). No other information is available. One grab sample of the quartz-sulfide mineralization contained 150 parts per billion (ppb) gold, 400 parts per million (ppm) bismuth, 1,000 ppb silver, 190 ppm arsenic, and 8.8 ppm tellurium (M.L. Miller, unpub. assay data, 1993). The occurrence is in the northeast corner of area of anomalous stream-sediment and panned-concentrate samples (Gray, Motooka, and Theodorako, 1997). Stream sediments contained up to 1.3 parts per million (ppm) gold, 150 ppm arsenic, 14 ppm bismuth, and elevated antimony and tungsten. Panned concentrates contained up to 200 ppm gold, 100 ppm silver, 500 ppm antimony, 3,000 ppm tungsten, and more than 2,000 ppm bismuth.
Workings: This occurrence was found in 1993 during a cooperative study by the Alaska Division of Geological and Geophysical Surveys and the U.S. Geological Survey in the Buckstock Mountains.
Age: Unknown. Miller and others (2002) report a U-Pb age of 59.2 Ma for the Buckstock pluton that makes up much of the area.
Alteration: Strong sericite alteration of dike or sill.
Commodities (Major) - Au, Bi, Te; (Minor) - Ag, As
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
1 valid mineral.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
Other Databases
| Link to USGS - Alaska: | SM050 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Farewell buried DomainDomain
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References
