Unnamed Occurrence (ARDF - CR175), Dora Lake, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 9' 18'' North , 132° 15' 0'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Hollis | 112 (2011) | 50.9km |
Location: This occurrence is in a borrow pit about 0.4 mile west-southwest of the southern tip of Dora Lake; it is about 0.6 mile northeast of the center of section 35, T. 77 S., R. 87 E.
Geology: In a borrow pit at this site, Maas and others (1991) identified mineralization similar to that at the Lucky Boy Mine (CR174), about 0.5 mile to the east. The pit exposes calcareous metasedimentary rocks and greenstone that contain stratiform quartz-calcite-sulfide veins and stringers. On older maps, these rocks were considered to be part of the Wales Group of Late Proterozoic and Cambrian age (Eberlein and others, 1983; Brew, 1996). More recent mapping, however, indicates that they are previously unrecognized Silurian and Ordovician metamorphic rocks that are less deformed than those of the Wales Group (S.M. Karl, oral communication, 2003). The prospect also includes a breccia zone about 5 feet thick that consists of rock fragments cemented by quartz and calcite with pyrite, sphalerite, and galena (Maas and others, 1991). A representative sample across the breccia contained 1,065 parts per billion (ppb) gold and 4,311 parts per million (ppm) zinc. A selected sample of sulfide-rich rock contained 6,797 ppb gold, 23.5 ppm silver, 3,210 ppm lead, and 8.87 percent zinc.
Workings: Only surface sampling in a borrow pit.
Age: The stratiform sulfide-bearing veins may represent Silurian or Ordovician massive-sulfide-type mineralization. The sulfide-bearing breccia is epigenetic and younger.
Commodities (Major) - Ag, Au, Pb, Zn
Development Status: None
Deposit Model: Breccia zone with sulfides; possible massive-sulfide-type mineralization in the
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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts | |||
|---|---|---|---|
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Galena | PbS |
| S | ⓘ Pyrite | FeS2 |
| Fe | Iron | |
| Fe | ⓘ Pyrite | FeS2 |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS - Alaska: | CR175 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
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