Unnamed Occurrence (ARDF - SD067; south-southeast of Turn Mountain), Petersburg Mining District, Wrangell City and Bourough, Alaska, USAi
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Latitude & Longitude (WGS84):
57° 3' 10'' North , 133° 49' 44'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Kake | 570 (2017) | 11.2km |
Location: This occurrence is about 1.0 mile south-southeast of Turn Mountain in a borrow pit along a logging road. It is about 0.5 mile southwest of the center of section 33, T. 55 S., R. 73 E.
Geology: This occurrences was first identified by Still and others (2002). It consists of a shear zone that cuts an intrusive body of Cretaceous black hornblendite that varies to dark gray hornblende gabbro (Karl and others, 1999). The shear zone contains quartz, potassium feldspar, and epidote, with pyrite and chalcopyrite. A layer of weathered pyrite about 1 to 3 inches thick with lenses of chalcopyrite is exposed along the shear zone for about 15 feet in the wall of a borrow pit. A select sample contained 30.6 parts per million (ppm) silver, 11.2 percent copper, and 1,253 ppm molybdenum (Still and others, 2002).
Workings: Only surface sampling by government geologists.
Age: The deposit is along a shear zone in Cretaceous hornblendite to gabbro.
Commodities (Major) - Ag, Cu, Mo
Development Status: None
Deposit Model: Shear zone with copper and molybdenum values.
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
4 valid minerals.
Detailed Mineral List:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Epidote Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| ⓘ 'K Feldspar' |
| ⓘ Pyrite Formula: FeS2 |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Epidote | 9.BG.05a | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Unclassified | |||
| ⓘ | 'K Feldspar' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | Oxygen | |
| O | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| O | ⓘ Quartz | SiO2 |
| Al | Aluminium | |
| Al | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | Silicon | |
| Si | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Si | ⓘ Quartz | SiO2 |
| S | Sulfur | |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| Ca | Calcium | |
| Ca | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | SD067 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
USA
- Alaska
- ⭔Wrangell-Petersburg Census AreaBorough
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