Independence Prospect, Woewodski Island, Petersburg Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Independence Prospect | Prospect |
| Woewodski Island | Island |
| Petersburg Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
56° 32' 50'' North , 133° 2' 30'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Petersburg | 2,948 (2017) | 29.9km |
Location: The Independence prospect consists of a shaft and 12 cuts that extend for about 1,800 feet along a quartz vein. The coordinates are at the shaft which is at an elevation of about 500 feet, about 0.3 mile north-northwest of the north end of Harrys Lake on Woewodski Island. It is about 0.5 mile north of the center of section 35, T. 61 S., R. 79 E.
Geology: The Independence prospect was found sometime before 1931 (Nelson, 1931) and by 1933 consisted of 12 cuts and a shaft 10 to 20 feet deep along a vein that extended for about 2,000 feet (Still and others, 2002). Apparently there has been no later work specifically on this prospect although much of the center of Woewodski Island has been covered by claims since the 1970's and this prospect probably still is. The rocks in the vicinity are mainly felsic volcanic rocks of the Triassic Hyd Group (Brew, 1997, Karl and others, 1999). At the south end of the prospect, the volcanics are cut by Cretaceous hornblende diorite. The mineralization consist of a quartz vein up to 10 feet thick that strikes north and has been traced on the surface for about 2,000 feet. Still and others (2002) collected 8 samples from the pits along the vein and from the shaft dump. Six contained less than 5 parts per billion (ppb) gold, one contained 74 ppb gold, and one contained 94 ppb gold.
Workings: The Independence prospect was found sometime before 1931 (Nelson, 1931) and by 1933 consisted of 12 cuts and a shaft 10 to 20 feet deep along a vein that extended for about 2,000 feet (Still and others, 2002). Apparently there has been no later work specifically on this prospect although much of the center of Woewodski Island has been covered by claims since the 1970's and this prospect probably still is.
Age: Cretaceous or younger based on the age of the diorite host rock to the vein.
Alteration: None specifically noted.
Reserves: None.
Commodities (Major) - Au
Development Status: None
Deposit Model: Au-quartz vein (Cox and Singer, 1986; model 36a).
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.
Detailed Mineral List:
| ⓘ Native Gold Formula: Au |
| ⓘ Quartz Formula: SiO2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| 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 |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | PE099 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
USA
- Alaska
- Petersburg Borough
- Kupreanof Mining DistrictMining District
- ⭔Wrangell-Petersburg Census AreaBorough
- Petersburg Borough
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References
Brew, David A. (1997) Reconnaissance geologic map of the Petersburg C-4 Quadrangle, southeastern Alaska. Open-File Report Vol. 1997 (97-156) US Geological Survey doi:10.3133/ofr97156j
