Weston Occurrence, Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Weston Occurrence | Occurrence |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 18' 26'' North , 141° 24' 10'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: The Weston scheelite occurence is located about 300 feet downstream of the Taylor Highway bridge on the lower Fortymile River. The coordinates are the approximate location of the veins on the south side of the river, in section 16, T. 7 S., R. 32 E., of the Fairbanks Meridian; the location is accurate.
Geology: The rocks along the lower Fortymile River (EA071) are Paleozoic amphibolite-facies gneiss, schist, quartzite, marble, and amphibolite (Foster, 1976). Bedrock in the immediate vicinity of the Weston scheelite occurrence is schist that has been intruded by several small granitic bodies of Tertiary or Mesozoic age (Saunders, 1957; Foster, 1976). The lower Fortymile River adjacent to the Weston occurrence has been mined for placer gold, and scheelite is abundant in sluice-box concentrates. In 1957, a narrow vein of scheelite-bearing quartz, 1 to 2 feet thick, was exposed at the Weston placer mine about 300 feet downstream of the Taylor Highway Bridge on the south side of the Fortymile River. Two similar quartz veins were found on the north side of the river. These veins are parallel to the veins on the south side of the river, and they are about 1 inch thick. Samples from a 1-inch-thick quartz vein containing scheelite were examined under ultraviolet light. One appeared to contain 5 to 10 percent WO3, and the other is somewhat lower in grade. Two other samples were assayed, but no gold, silver or tungsten were present (Saunders, 1957).
Workings: In 1957, a narrow vein of scheelite-bearing quartz was exposed by placer mining about 300 feet downstream of the Taylor Highway Bridge on the south side of the Fortymile River. Two similar veins were found on the north side of the river (Saunders, 1957).
Commodities (Major) - W
Development Status: None
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 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Scheelite | Ca(WO4) |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Ca | Calcium | |
| Ca | ⓘ Scheelite | Ca(WO4) |
| W | Tungsten | |
| W | ⓘ Scheelite | Ca(WO4) |
Other Databases
| Link to USGS - Alaska: | EA082 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Yukon-TananaVolcanic Arc
- Yukon-Tanana upper DomainDomain
USA
- Alaska
- Fortymile Mining DistrictMining District
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