Unnamed Occurrence (ARDF - EA118; north of Napoleon Creek), Southeast Fairbanks Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - EA118; north of Napoleon Creek) | - not defined - |
| Southeast Fairbanks Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
64° 8' 9'' North , 141° 43' 11'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of about 2,600 feet on a ridge about 2.6 miles southeast of the old town of Franklin. The occurrence is in section 8, 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 that have been intruded by small Jurassic plutons and dikes (Werdon and others, 2001). The Jurassic igneous rocks are generally white, fine-grained, aplitic- to graphic-textured granite dikes, but they transition westward into a tan, fine- to medium-grained, equigranular, biotite granite. Both the white and tan granites are cut by stockwork milky, quartz veins. Most quartz veins do not contain visible sulfides, but maany of the white granites contain as much as 2 percent disseminated limonite (pseudomorphs after pyrite?). Calc-silicate skarn float is present above the intrusions; t contains pyrrhotite, pyrite, and an unknown silver-gray mineral (hematite or molybdenite?); ore samples contain 120 ppm tungsten. An iron-stained, color-banded quartzite (or former quartzose gneiss?) with pyrite(?) or pyrrhotite along fracture surfaces contains 45 ppm molybdenum and 212 ppm zinc; a quartzite or hornfels with iron-sulfides and unknown silver-gray mineral contains 26 ppm molybdenum, 276 ppm lead, and 550 ppm zinc (Werdon and others, 2000).
Age: Probably related to a Jurassic pluton.
Alteration: Hornfelsing and the development of a calc-silicate skarn on the margin of the pluton.
Commodities (Major) - Mo, Pb, W, Zn
Development Status: None
Deposit Model: Pb-Zn 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
3 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Quartz | SiO2 |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Pyrrhotite | Fe1-xS |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Pyrrhotite | Fe1-xS |
Other Databases
| Link to USGS - Alaska: | EA118 |
|---|
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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