Saginaw Bay occurrence, Kuiu Island, Petersburg Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Saginaw Bay occurrence | Occurrence |
| Kuiu Island | Island |
| Petersburg Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
56° 52' 14'' North , 134° 13' 4'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Kake | 570 (2017) | 20.2km |
Other/historical names associated with this locality:
ARDF - PA031
MAS number: 0021160015.
Location: This occurrence is near the middle of the southwest shoreline of Saginaw Bay. It is about 1.8 miles southeast of Sachem Island and about 0.3 mile north-northwest of the center of section 3, T. 58 S., R. 71 E. The location is accurate.
Geology: This occurrence is one of a group of similar deposits (PA021 to PA031) that are scattered along the south shore of Saginaw Bay, on the peninsula north of Saginaw Bay, and on the Keku Islands. They occur in a heterogeneous section of unmetamorphosed volcanic, carbonate, and clastic rocks that vary in age from Silurian to Triassic (Muffler, 1967).
The mineralization generally consists of veins, veinlets, and irregular pods that contain base metals and barite (Still and others, 2002). There are no plutonic rocks in the immediate vicinity; however, the sedimentary rocks are cut by scattered gabbro dikes. The origin of the deposits is uncertain although most appear to be epigenetic. Various origins have been proposed including that they are remobilized massive-sulfide deposits, that they are related to a buried intrusive, or that they are Mississippi-Valley-type deposits.
This occurrence was first mentioned by Buddington (1925) but there is no indication that claims have ever been staked on it or that it has been explored. The occurrence is in thin-bedded limestone of the Silurian Kuiu Limestone (Muffler, 1967). Barite occurs in widely spaced, subparallel veins that pinch and swell and vary from stringers to 2.5 feet wide (Still and others, 2002). The longest can be traced for 20 feet. The veins are composed of pinkish-white blades of barite with calcite and probably witherite. There are no reports of significant base metals.
Workings: This occurrence was first mentioned by Buddington (1925) but there is no indication that claims have ever been staked on it or that it has been explored.
Age: Younger than the Silurian host rock.
Reserves: None.
Commodities (Major) - Ba
Development Status: None
Deposit Model: Barite veins.
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 5 - Nitrates and Carbonates | |||
|---|---|---|---|
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Witherite | 5.AB.15 | BaCO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte | 7.AD.35 | BaSO4 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Witherite | BaCO3 |
| O | Oxygen | |
| O | ⓘ Baryte | BaSO4 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Witherite | BaCO3 |
| S | Sulfur | |
| S | ⓘ Baryte | BaSO4 |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
| Ba | ⓘ Witherite | BaCO3 |
Other Databases
| Link to USGS - Alaska: | PA031 |
|---|
Other Regions, Features and Areas containing this locality
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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