Mexico and Belvedere Prospect, Juneau Mining District, Juneau, Alaska, USAi
| Regional Level Types | |
|---|---|
| Mexico and Belvedere Prospect | Prospect |
| Juneau Mining District | Mining District |
| Juneau | City Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
58° 15' 35'' North , 134° 22' 8'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Juneau | 32,756 (2017) | 5.6km |
Mindat Locality ID:
198854
Long-form identifier:
mindat:1:2:198854:6
GUID (UUID V4):
32d5b8bd-df42-492c-959f-36fb44076e5b
Location: This prospect is at an elevation of approximately 400 feet on Douglas Island, 1/4 mile southwest of the shore of Gastineau Channel and 0.4 mile south-southwest of the abandoned townsite of Treadwell. It is near the center of the east side the NE1/4 section 1, T. 42 S., R. 67 E. of the Copper River Meridian. The location is accurate.
Geology: The Mexico and Belvedere prospect was discovered before 1886 and was developed by a 301-foot adit and a caved shaft. The rocks at the prospect consist of black phyllite intruded by a hornblende diorite sill that is 140 feet thick (Redman and others, 1989). The margins of the sill are hydrothermally altered and pyrite cubes are disseminated in these altered margins. The core of the sill is unaltered. U.S. Bureau of Mines samples contained up to 0.07 ppm gold and 0.3 ppm silver (Redman and others, 1989). The rocks in the general area are Upper Jurassic or Cretaceous marine argillite and graywacke, interbedded with andesite or basalt (Brew and Ford, 1985). The bedded rocks are regionally metamorphosed to prehnite-pumpellyite or greenschist grade, and cut by diorite or gabbro dikes and sills.
Workings: The Mexico and Belvedere prospect was discovered before 1886 and was developed by a 301-foot adit and a caved shaft.
Alteration: The margins of the hornblende diorite sill are hydrothermally altered and pyritized.
Commodities (Major) - Au; (Minor) - Ag
Development Status: None
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: | JU205 |
|---|
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References
