Copper Gold Occurrences, Annette Bay, Annette Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 14' 26'' North , 131° 30' 56'' West
Latitude & Longitude (decimal):
Type:
Group of Occurrences
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Saxman | 417 (2017) | 10.0km |
| Metlakatla | 1,405 (2017) | 13.0km |
| Ketchikan | 8,197 (2017) | 14.0km |
Location: This site represents seven occurrences distributed in a triangular lowland area of about a square mile, whose apices are near the east foot of Nubbins Mountain, the northeast foot of Bush Mountain, and the northeast head of Annette Bay. The occurrences are in sections 25, 35, and 36, T. 76 S., R. 91 E., of the Copper River Meridian. The coordinates are for the approximate center of the area of occurrences. The site corresponds to loc. 5a-g in Karl (1992). The location is accurate within about 0.2 mile.
Geology: The country rocks in the area of this site are Upper Jurassic or Cretaceous andesitic or basaltic metavolcanic rocks that are gradationally interbedded with subordinate flyschlike metasedimentary rocks (Berg, 1972 [I 684]; Berg and others, 1988). The bedded rocks are intruded by a Jurassic or Cretaceous stock and dikes of diorite and quartz diorite. The rocks were regionally metamorphosed to greenschist-grade phyllite and semischist in Late Cretaceous time. The occurrences all are in propylitized diorite that contains about 5 percent of disseminated pyrite, and pyrite seams along fractures (Karl, 1992, loc. 5a-g). Samples of the diorite contained up to 0.26 ppm Au, 300 ppm Cu, 1500 ppm Zn, and 10 ppm Mo; a sample of chalcopyrite-bearing diorite near its contact with the bedded rocks contained 300 ppm Cu. The distribution and setting of the disseminated sulfide mineralization suggest that it may in part be cogenetic with Jurassic or Cretaceous emplacement of the diorite hostrock.
Workings: Samples of the diorite contained up to 0.26 ppm Au, 300 ppm Cu, 1500 ppm Zn, and 10 ppm Mo; and a sample of chalcopyrite-bearing greenstone near a diorite contact contained 300 ppm Cu (Karl, 1992, loc. 5a-g).
Age: Disseminated sulfide mineralization may in part be cogenetic with Jurassic or Cretaceous emplacement of the diorite hostrock.
Alteration: Diorite hostrock is propylitized.
Commodities (Major) - Au, Cu, Pb
Development Status: None
Deposit Model: Disseminated sulfide deposit of late magmatic origin?
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: | KC162 |
|---|
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Alexander DomainDomain
- Alexander TerraneVolcanic Arc
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