Marble Heart Prospect, Twelvemile Arm, Kasaan Bay, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 19' 20'' North , 132° 43' 55'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Hydaburg | 391 (2017) | 14.1km |
| Hollis | 112 (2011) | 26.7km |
| Craig | 1,248 (2017) | 31.4km |
| Klawock | 765 (2017) | 34.3km |
| Thorne Bay | 483 (2017) | 42.7km |
Location: The location of the Marble Heart prospect is uncertain. The primary and almost only description of it is by Brooks (1902). Herreid and Rose (1966) place it just outside the area they mapped. The Herreid and Rose location used for this record is about 1.8 miles south of the head of Twelvemile Arm and about 0.2 mile west of the center of section 36, T. 75 S., R. 83 E.
Geology: As described by Brooks (1902), the Marble Heart prospect consists of a small vein of galena in intensely folded and metamorphosed limestone. The limestone is part of the Wales Group of Cambrian and older age (Eberlein and others, 1983; Brew, 1996). The workings consist of a shaft about 20 feet deep and a short adit.
Workings: The workings consist of a shaft about 20 feet deep and a short adit.
Age: Galena vein in limestone of Cambrian or older age.
Commodities (Major) - Pb
Development Status: None
Deposit Model: Galena vein in limestone.
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 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Galena | 2.CD.10 | PbS |
Other Databases
| Link to USGS - Alaska: | CR112 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
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