Unnamed Occurrence (ARDF - EA006; headwaters of Slate Creek), Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - EA006; headwaters of Slate Creek) | - not defined - |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 46' 18'' North , 142° 38' 49'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This unnamed occurrence is a large mineralized quartz vein that was traced for several hundred feet along a small tributary near the head of Slate Creek. The coordinates are the map location of Foster (1970), in section 1, T. 2 S., R. 25 E., of the Fairbanks Meridian. The location is accurate within one-half mile. This unnamed occurrence is locality 171 on figure 2 in Foster (1970), but there is a misprint in the text that refers to figure 1. Locality 7 in the text of Cobb (1972 [MF-393]) refers to this unnamed occurrence, but the map location of Cobb (1972 [MF-393]) is incorrect due to the misprint in Foster (1970). This unnamed occurrence is locality 57 of Eberlein and others (1977).
Geology: This occurrence is a large mineralized quartz vein in granitic rocks, mostly granodiorite, that can be traced for several hundred feet along a small tributary near the head of Slate Creek (Foster, 1970). The vein is 2 to 5 feet wide, and contains as much as 80 ppb gold, 0.7 ppm silver, and greater than 10,000 ppm arsenic. A felsic dike that cuts granodiorite one-half mile to the east contains 1,000 ppm lead and 1,500 ppm zinc. Felsic dikes are abundant in the headwaters of Slate Creek and form orange-brown stained zones that can be recognized from a distance. The Ole Creek prospect (EA007) is 3 miles to the east. Biotite from a nearby granite on upper Granite Creek (see EA128) adjacent to a gold-bearing quartz-arsenopyrite vein gives a 40Ar/39Ar plateau age of 93.3 +/- 0.5 Ma (Newberry and others, 1996). The veins here are similar and occurrence is also probably Cretaceous or younger.
Workings: Samples were collected at this unnamed occurrence at the headwaters of Slate Creek by the U.S. Geological Survey in 1969 (Foster, 1970).
Age: Biotite from a nearby granite on upper Granite Creek (EA005) adjacent to a gold-bearing quartz-arsenopyrite vein gives a 40Ar/39Ar plateau age of 93.3 +/- 0.5 Ma (Newberry and others, 1996). The veins here are similar and occurrence is also probably Cretaceous or younger.
Commodities (Major) - Ag, Au; (Minor) - Pb, Zn
Development Status: None
Deposit Model: Possibly Comstock epithermal veins (Cox and Singer, 1986; model 25c?).
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: | EA006 |
|---|
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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