Unnamed Occurrence (ARDF - PE113; southwest of St. Johns Harbor), Petersburg Mining District, Wrangell City and Bourough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - PE113; southwest of St. Johns Harbor) | - not defined - |
| Petersburg Mining District | Mining District |
| Wrangell City and Bourough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
56° 25' 26'' North , 132° 59' 2'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Petersburg | 2,948 (2017) | 43.2km |
| Coffman Cove | 180 (2017) | 46.6km |
Location: The occurrence is in fill on Forest Service Road 52009. It is about 0.8 mile southwest of Zarembo Springs at the head of St. Johns Harbor and about 0.2 mile northeast of the center of section 7, T. 63 S., R. 80 E.
Geology: Still and others (2002) found road fill on a logging road southwest of St. Johns Harbor that contained vuggy quartz, purple fluorite, and (unidentified) sulfides. A grab sample of the more sulfide-rich quartz and fluorite in the road fill contained 546 parts per billion gold and 826 parts per million arsenic. They could not locate the source of the fill; it may have come from a fluorite occurrence about 10 miles to the south (PE060) but they felt the source was nearby and it seems unlikely that anyone would truck fill in from the occurrence to the south when there are so many borrow pits nearby. They did not discuss the petrology of the road fill. As mapped by Karl and others (1999), the rocks in the immediate area are sedimentary and volcanic rocks of the Triassic Hyd Group . But there are large areas of Quaternary and Tertiary rhyolite just to the south and there is a borrow pit about a half mile to the west that may be in this rhyolite.
Workings: Only sampling by government geologists.
Age: Probably Tertiary based on the age of rhyolite of that age nearby.
Commodities (Major) - As, Au, F
Development Status: None
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 3 - Halides | |||
|---|---|---|---|
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
Other Databases
| Link to USGS - Alaska: | PE113 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
USA
- Alaska
- ⭔Wrangell-Petersburg Census AreaBorough
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