Unnamed Occurrence (ARDF - EA117; east of South Fork), Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - EA117; east of South Fork) | - not defined - |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 8' 42'' North , 141° 41' 45'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is along a tractor trail on a ridge top at an elevation of about 3,050 feet about 2.9 miles east-southeast of the old town of Franklin. The occurrence is in section 4, T. 27 N., R. 19 E., of the Copper River Meridian. The location is accurate.
Geology: The rocks in the vicinity of this occurrence are interlayered Paleozoic, amphibolite-facies paragneiss, schist, amphibolite, orthogneiss, and minor marble (Werdon and others, 2001) that to the south have been intruded by small Jurassic plutons. Quartz-feldspar-white mica gneiss is iron-oxide stained and contains disseminated limonite cubes (pseudomorphs after pyrite?). Pyrite cubes approximately 1 millimeter in diameter occur within vuggy quartz veins. Many fractures are filled with limonite. An assay of this material contains 40 ppm arsenic, 444 ppm lead, and 136 ppm zinc (Werdon and others, 2000).
Age: Paleozoic or younger; possibly related to nearby Jurassic intrusions.
Alteration: Quartz-feldspar-white mica gneiss at the site is iron-oxide stained and contains disseminated limonite cubes (pseudomorphs after pyrite?).
Commodities (Major) - Pb, Zn; (Minor) - As
Development Status: None
Deposit Model: Distal Zn-Pb skarn?
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 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Unclassified | |||
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
Other Databases
| Link to USGS - Alaska: | EA117 |
|---|
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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