Unnamed Occurrence (ARDF - DE009), Lake Seclusion, Long Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
54° 49' 51'' North , 132° 42' 54'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Hydaburg | 391 (2017) | 42.5km |
NOTE: The subsurface rights to the land in the vicinity are held by the Sealaska Corporation.
Location: This occurrence is southeast of Lake Seclusion. It is in rock pit LI-1300-7 on logging road 1300, in about the middle of section 21, T. 81 S., R. 85 E. The location is accurate.
Geology: This occurrence is a 4-inch-thick galena vein discovered in the bottom of a rock pit by Sealaska Corporation geologists in 1988 (Hedderly-Smith, 1999). The rocks in the vicinity are pre-Ordovician dacitic metavolcanic rocks, marble, and argillite (Gehrels, 1991). A rock chip sample contained 2.40 percent copper, 10.30 percent lead, 7.54 percent zinc, 80.98 ounces of silver per ton, and 0.207 ounce of gold per ton. Workers in the area are said to have collected vein samples up to 6 inches thick. This or a similar vein in the same pit was sampled by Maas and others (1991) who describe it as a thin, vertical, calcite vein that strikes north-northwest and contains tetrahedrite and copper carbonates. Their best sample contained 41.62 ounces of silver per ton, 4.2 parts per million (ppm) gold, 1.38 percent copper, and 7,036 ppm zinc.
Workings: Exploration consists only of sampling the vein in outcrop by private and government geologists.
Age: Vein cuts pre-Ordovician rocks.
Alteration: Oxidization of sulfides.
Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: None
Deposit Model: Silver-bearing calcite vein in metamorphic rocks.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsDetailed Mineral List:
| ⓘ Calcite Formula: CaCO3 |
| ⓘ Galena Formula: PbS |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ 'Tetrahedrite Subgroup' Formula: Cu6(Cu4C2+2)Sb4S12S |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | 'Tetrahedrite Subgroup' | 2.GB.05 | Cu6(Cu4C2+2)Sb4S12S |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | Carbon | |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | Oxygen | |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| S | Sulfur | |
| S | ⓘ Galena | PbS |
| S | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Ca | Calcium | |
| Ca | ⓘ Calcite | CaCO3 |
| Cu | Copper | |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
| Cu | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Sb | Antimony | |
| Sb | ⓘ Tetrahedrite Subgroup | Cu6(Cu4C22+)Sb4S12S |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | DE009 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
- Queen Charlotte basinBasin
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