Unnamed Prospect (ARDF - CR029), Black Bear Lake, Prince of Wales Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 30' 15'' North , 132° 52' 26'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Klawock | 765 (2017) | 14.9km |
| Hollis | 112 (2011) | 16.0km |
| Craig | 1,248 (2017) | 17.6km |
| Thorne Bay | 483 (2017) | 30.0km |
| Hydaburg | 391 (2017) | 33.1km |
The land in the vicinity of this prospect has been identified for possible selection by the Sealaska Corporation.
Location: This is the site of a hole that was diamond drilled in the early 70's. There were probably several more holes in the vicinity, and this site is at about the center of a block of claims explored by those holes that covered at least a square mile. The site is about 0.6 mile south-southeast of the center of section 25, T. 73 S., R. 82 E., and about 0.6 mile due east of peak 3344.
Geology: This prospect is at the pad of a diamond drill hole put down by AlVenCo, Inc. in the early 1970's There is at least one other hole nearby. The hole was drilled to test the presence of a probable buried, copper-molybdenum porphyry deposit (Frankhauser, 1969; Hedderly-Smith, 1999 [Inventory]). The prospective deposit underlies an area about a mile long and a half-mile wide that is oriented north-south. The area is geochemically anomalous and marked by extensive hornfelsing, disseminated pyrite, silicification and sericitization, and scattered occurrences of molybdenite. The rocks in the area consist of metamorphosed shale, sandstone, and andesite of the Luck Creek Breccia of Silurian or Ordovician age that are cut by several types of intermediate igneous rocks. The hole probably went into granodiorite a few hundred feet from the surface. About 1,200 feet to the southeast, a zone about 8 feet in diameter of sheared and bleached andesite of the Descon Formation contains 50-75 percent pyrite (Hedderly-Smith,1999 [Inventory]). A sample contained 706 parts per million (ppm) copper, 147 ppm lead, 2,142 ppm zinc, 29.1 ppm silver, and 2.557 ppm gold. Hedderly-Smith suggests that the intrusion that Alvenco drilled also has potential as a gold porphyry.
Workings: At least two diamond-drill holes were put down in the early 1970's; considerable surface prospecting took place then and in the 1990's.
Age: Probably related to a buried Cretaceous pluton.
Alteration: Silicification, sericitization, hornfelsing, and bleaching of metavolcanic and meta-sedimentary rocks.
Commodities (Major) - Ag, Au, Cu, Mo, Pb, Zn
Development Status: None
Deposit Model: Porphyry copper-molybdenum-gold deposit (Singer and Cox, 1986; model 21a).
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 | |||
|---|---|---|---|
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
Other Databases
| Link to USGS - Alaska: | CR029 |
|---|
Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
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