Black Mountain Prospect, Aniak Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Black Mountain Prospect | Prospect |
| Aniak Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 47' 27'' North , 159° 18' 14'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Chuathbaluk | 125 (2017) | 24.5km |
| Aniak | 528 (2017) | 26.3km |
| Holy Cross | 177 (2017) | 51.6km |
Location: Black Mountain, unnamed on the USGS 1:63,360 topographic map (1952 edition) of the area, is an isolated 1585-foot-high upland about 2.3 miles southwest of Molybdenum Mountain. The map site is 0.25 mile south of the summit of Black Mountain at an elevation of about 1,350 feet. It is in the SW/4 sec. 29, T. 20 N., R. 55 W., of the Seward Meridian. This is locality 3 of Hoare and Cobb (1972, 1977). Hoare and Coonrad (1959) show a prospect symbol at this location.
Geology: A single, 2-inch wide, stibnite-bearing vein in shaly sandstone was traced for a distance of 200 feet at this location (Ebbley and Wright, 1948). The vein trends subparallel to the contact between clastic sedimentary country rocks and a granitic stock upslope to the north of the vein (Ebbley and Wright, 1948; Hoare and Coonrad, 1959). Host rocks to the vein are not altered, and only one vein has been identified at this prospect. A sample collected along 50 feet of the vein contained 48.9 percent antimony, 0.02 ounce of gold per ton, and 0.2 ounce of silver per ton (Ebbley and Wright, 1948). The sedimentary rocks may either be part of the mid-Cretaceous Kuskokwim Group (Hoare and Coonrad, 1959), or possibly an upper Paleozoic or Mesozoic section correlative with parts of the Gemuk Group (Bundtzen and Laird, 1991). The nearby granitic rocks may be part of a Cretaceous or Tertiary igneous assemblage that is widespread through southwest Alaska.
Workings: Cady and others (1955) reported that claims have been staked on the prospect. Some small pits or trenches are probably present.
Age: Cretaceous or Tertiary (?). The vein crosscuts clastic sedimentary rocks that may range in age from lare Paleozoic to mid-Cretaceous (Bundtzen and Laird, 1991). The nearby granitic rocks may be Cretaceous or Tertiary.
Commodities (Major) - Ag, Au, Sb
Development Status: None
Deposit Model: Simple Sb deposits (Cox and Singer, 1986; model 27d)
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 | |||
|---|---|---|---|
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
Other Databases
| Link to USGS - Alaska: | RM011 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Nyac DomainDomain
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