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Ptarmigan Prospect, Aniak Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Ptarmigan Prospect | Prospect |
| Aniak Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 37' 55'' North , 159° 13' 44'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Chuathbaluk | 125 (2017) | 6.7km |
| Aniak | 528 (2017) | 16.6km |
Location: The Ptarmigan prospect is on the southwest flank of the Russian Mountains. It is on the low ridge along the west side of Mission Creek, opposite the mouth of Ptarmigan Gulch. The map site is at an elevation of about 1,050 feet and about 0.25 mile south-southeast of the center of sec. 22, T. 18 N., R. 55 W., of the Seward Meridian. This is sample locality 19 of Bundtzen and Laird (1991).
Geology: Bundtzen and Laird (1991) report that a brecciated and quartz-flooded zone in hornfels contains small vugs lined with euhedral, even doubly terminated, amethyst crystals to 5 centimeters long. A sample of this material contained 38 ppm uranium. The hornfels is developed in Cretaceous clastic sedimentary rocks peripheral to the intrusive complex of the Russian Mountains (Bundtzen and Laird, 1991).
Workings: Some small surface pits may be present.
Age: Late Cretaceous or Tertiary. Veins post-date hornfels developed around the intrusive complex of the Russian Mountains. Quartz monzonite from this complex has yielded a K/Ar age of 70.3 +/- 2.1 Ma (Bundtzen and Laird, 1991).
Alteration: Silicification.
Commodities (Major) - U; (Minor) - Amethyst
Development Status: None
Deposit Model: Silicified zone in hornfels
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsGallery:
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: | RM014 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Farewell buried DomainDomain
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