Unnamed Occurrence (ARDF - WI072; west of Twoday Mountain), Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - WI072; west of Twoday Mountain) | - not defined - |
| Koyukuk Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
67° 16' 11'' North , 151° 44' 24'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is between upper Timber and Suckik Creeks, about 5 miles south-southwest of Twoday Mountain. The occurrence is locality 88 of Dillon and others (1981 [AOF 133B]). It is at an elevation of about 3,950 feet, about 0.6 mile south-southeast of the center of section 4, T. 28 N., R. 19 W., of the Fairbanks Meridian. The location is accurate.
Geology: This occurrence consists of banded marble that locally contains layers with 10% sphalerite that replaces pyrite(?) (Dillon, 1981 [AOF 133B]). However, a grab sample from outcrop, contains only 25 ppm Zn and no other anomalous metal values. The rocks in the area are Devonian(?) or older(?), black slate, phyllite, and limestone (Bliss and others, 1988). No other information is available.
Workings: Only surface sampling.
Commodities (Major) - Zn(?)
Development Status: None
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Pyrite ? Formula: FeS2 |
| ⓘ Sphalerite Formula: ZnS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Pyrite ? | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
Other Databases
| Link to USGS - Alaska: | WI072 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Brooks RangeMountain Range
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Brooks Range DomainVolcanic Arc
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