Unnamed Occurrence (ARDF - SM033; east tributary of Kolmakof River), Aniak Mining District, Bethel Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - SM033; east tributary of Kolmakof River) | - not defined - |
| Aniak Mining District | Mining District |
| Bethel Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 43' 51'' North , 158° 34' 29'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Crooked Creek | 105 (2016) | 28.9km |
Location: This placer occurrence is at the head of an unnamed, east tributary of the Kolmakof River that drains the western slopes of the Horn Mountains. The location of the occurrence provided by Cady and others (1955) is vague. Gray and others (1994) describe a heavy mineral placer occurrence at an elevation of about 1,600 feet in the SW 1/4 sec. 17, T. 19 N., R. 51 W of the Seward Meridian that may coincide with this occurrence. The location is approximate.
Geology: Abundant scheelite (CaWO3) and gold were found in Quaternary gravel on the western side of the Horn Mountains at some unknown location prior to 1951 and probably prior to WWI (M. Hofseth, oral communication, 1990; Cady and others (1955). Theodorakos and others (1992), and Gray and others (1994) reported values of up to 500 parts per million (ppm) gold, 20 ppm silver, and 120 ppm arsenic in panned concentrates and stream sediment samples along this creek, but no anomalous tungsten. The rocks in the vicinity consist of the Upper Cretaceous Horn Mountains pluton, the slightly older Horn Mountains volcanic rocks, and contact metamorphic rocks at the contact of the pluton and the volcanics (Bundtzen and others, 1998).
Workings: There was surface sampling by prospectors before 1951 (Cady and others, 1955). The U.S. Geological Survey resampled the area in 1988, 1989, and 1990 (Theodorakos and others, 1992; Gray and others, 1994). Bundtzen and others (1998) mapped, sampled, and described the Quaternary deposits in the area.
Age: Late Pleistocene-Holocene, based on dated glacial chronology established in Horn Mountains by Bundtzen and others (1998).
Commodities (Major) - Ag, Au; (Minor) - As, W
Development Status: No
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a).
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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Ilmenite | 4.CB.05 | Fe2+TiO3 |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Scheelite | 7.GA.05 | Ca(WO4) |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Ilmenite | Fe2+TiO3 |
| O | ⓘ Scheelite | Ca(WO4) |
| Ca | Calcium | |
| Ca | ⓘ Scheelite | Ca(WO4) |
| Ti | Titanium | |
| Ti | ⓘ Ilmenite | Fe2+TiO3 |
| Fe | Iron | |
| Fe | ⓘ Ilmenite | Fe2+TiO3 |
| W | Tungsten | |
| W | ⓘ Scheelite | Ca(WO4) |
Other Databases
| Link to USGS - Alaska: | SM033 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Angayucham TerraneAccretionary Complex
- Farewell buried DomainDomain
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