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Silver Gold Occurrence, Metlakatla, Annette Island, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
55° 7' 4'' North , 131° 32' 34'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Metlakatla | 1,405 (2017) | 2.4km |
| Saxman | 417 (2017) | 22.5km |
| Ketchikan | 8,197 (2017) | 25.8km |
Location: This occurrence is at an elevation of about 300 feet, at the southeast corner of Port Chester, about a mile from the town of Metlakatla, and near the foot of the trail to Chester Lake. The site is in section 10, T. 78 S., R. 92 E., of the Copper River Meridian. It corresponds to loc. 44 in Karl (1992). The location is accurate within 0.1 mile.
Geology: The country rock in the area of this site is Silurian trondhjemite (Berg, 1972 [I 684]; Berg and others, 1988). The site is in or near a major N-S fault zone between mainland Annette Island and the peninsula containing the town of Metlakatla. The trondhjemite in and near this zone is intensely sheared and brecciated, with widespread sericitization, silicification, and formation of hydrothermal(?) potassium feldspar and specular hematite. Some of these features probably are due to Late Cretaceous greenschist-grade regional metamorphism, and some to subsequent large-scale faulting. The occurrence consists of disseminated pyrite and hematite, and of thin seams of pyrite, in a 1000-foot-wide zone of cataclastic, pervasively altered, granitic rock (Karl, 1992, loc. 44). A sample of hematitic granitic rock contained 0.28 ppm Au and 5 ppm Ag; a sample from a pyrite seam contained 0.7 ppm Ag and 20 ppm Mo.
Workings: A sample of hematitic granitic rock contained 0.28 ppm Au and 5 ppm Ag; a sample from a pyrite seam contained 0.7 ppm Ag and 20 ppm Mo (Karl, 1992, loc. 44).
Age: Probably Late Cretaceous or younger.
Alteration: Sheared granitic hostrock is silicified and/or sericitized, and permeated with hydrothermal hematite.
Commodities (Major) - Ag, Au, Mo
Development Status: None
Deposit Model: Disseminated sulfide and iron mineralization of undetermined origin in granitic
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: | KC178 |
|---|
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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