Unnamed occurrence (ARDF - CR144), Eek Lake, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 10' 33'' North , 132° 40' 48'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an uncertain location west of Eek Lake. For this record, the coordinates are at about the middle of the west shore of Eek Lake in section 24, T77S, R84E. Alternatively, the occurrence may be on the west side of the large unnamed lake just to the south in section 25. It thus may be a mile or more from the coordinates.
Geology: While following up a geophysical anomaly in 1992, Alaska Copper and Nickel Company found what they originally thought was a stratiform pyrite-chalcopyrite deposit on the west side of Eek Lake (Hedderly-Smith, 1999 [Inventory]). Samples across 1 meter of outcrop contained 5.2 to 10 percent copper, 251 to 269 parts per million (ppm) zinc, and 5.0 to 6.1 ppm silver. The company subsequently revisited the property and concluded that it was a vein, based on samples that contained up to 111 ppm molybdenum. There is no other information about the deposit. It may be on either side of a fault contact between greenstone, schist, and phyllite of the Wales Group of Late Proterozoic and Cambrian age and sedimentary rocks of the Descon Formation of Silurian and Ordovician age (Eberlein and others, 1983; Brew, 1996).
Workings: Limited surface sampling by industry in 1992.
Commodities (Major) - Ag, Cu, Mo, Zn
Development Status: None
Deposit Model: Ambiguous.
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:
| ⓘ Chalcopyrite Formula: CuFeS2 |
| ⓘ Pyrite Formula: FeS2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Pyrite | FeS2 |
| Cu | Copper | |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
Other Databases
| Link to USGS - Alaska: | CR144 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
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