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Unnamed Occurrence (ARDF - EA138; southeast of hill 3560), Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - EA138; southeast of hill 3560) | - not defined - |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 2' 49'' North , 141° 40' 22'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is near a four-wheeler (all-terrain vehicle) trail on a ridgeline northeast of Wall Street Creek. It is about 0.5 mile southeast of hill 3560. The occurrence is in section 10, T. 26 N., R. 19 E., of the Copper River Meridian. The location is accurate.
Geology: The rocks in the vicinity of this occurrence are Paleozoic amphibolite-facies paragneiss, quartzite, schist, and amphibolite and Mississippian to Devonian augen gneiss and orthogneiss (Werdon and others, 2001). These units are cut by a prominent, 50-foot-wide, northeast-trending, high-angle fault that can be seen as a topographic linear in air photos. Biotite(?) in schist and gneiss in the fault zone is altered to chlorite. An assay of iron-stained fault breccia with angular schist and (or) gneiss clasts cemented by crystalline quartz with open vugs contains 30 ppb gold (Szumigala and others, 2000).
Age: Missippian or younger, because the fault offsets Mississippian to Devonian augen gneiss and orthogneiss.
Alteration: Chlorite alteration of biotite(?) in schist and gneiss.
Commodities (Major) - Au
Development Status: None
Deposit Model: Fault-hosted gold.
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: | EA138 |
|---|
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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