Unnamed Occurrences (ARDF - SD047; near 'Spruce Mountain'), Petersburg Mining District, Hoonah-Angoon Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrences (ARDF - SD047; near 'Spruce Mountain') | - not defined - |
| Petersburg Mining District | Mining District |
| Hoonah-Angoon Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
57° 35' 13'' North , 133° 16' 1'' West
Latitude & Longitude (decimal):
Köppen climate type:
The occurrences are in the Chuck River Wilderness Area which is closed to prospecting and mining.
Location: These occurrences identified by Kimble and others (1984) are part of a large altered zone with metal values (1984). The occurrences are scattered along a zone about 5,000 feet long oriented north-northwest. The center of the area is about 0.4 mile north of hill 4330 which is locally called 'Spruce Mountain'. It is about 0.5 mile southwest of the center of section 29, T. 49 S., R. 76 E.
Geology: These occurrences are part of a band of prospects and mineral occurrences (SD046-049) in what is often referred to as the Third Zone of Spencer (1906; Kimble and others (1984). These are generally gold-quartz veins and veinlets in muscovite schist of Cretaceous age (Brew and Grybeck, 1984). However, this deposit is notably different from many of the prospects in the Windham Bay area in that the mineralization is stratiform. This site is a narrow zone that trends north-northwest for about 5,000 feet. Numerous occurrences along the zone consist of weathered, limonite-stained bands parallel to the foliation of the muscovite schist (Kimble and others, 1984). There are no workings. Of the 18 samples collected by Kimble and others (1984) along the zone, four have notable metal values: 1) a 100-foot chip sample contained 5 parts per million (ppm) silver, 1,300 ppm lead, and 7,600 ppm zinc; 2) a 17-foot chip sample contained 3 ppm silver, 0.05 ppm gold, and 1,900 ppm zinc; 3) a 105-foot chip sample contained 3 ppm silver, 0.05 ppm gold, 390 ppm copper, 60 ppm lead, and 2,100 ppm zinc; and 4) a 50-foot chip sample contained 2 ppm silver, 170 ppm lead, and 1,000 ppm zinc.
Age: In schist of Cretaceous (meamorphic) age; the age of the protolith is unknown.
Alteration: The occurrences are in iron-strained schist with limonite.
Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: None
Deposit Model: Unclear; may be syngenetic or epigenetic and related to the numerous gold-quartz
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.List of minerals for each chemical element
Other Databases
| Link to USGS - Alaska: | SD047 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Taku DomainDomain
- Yukon-TananaVolcanic Arc
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