Unnamed Occurrence (ARDF - TL052; on Portage Creek), Yentna Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - TL052; on Portage Creek) | - not defined - |
| Yentna Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 0' 36'' North , 152° 51' 54'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: Reed and others (1978, locality 36) locate this occurrence in the southwest quarter of Section 12, T. 22 N., R. 20 W., of the Seward Meridian at about 2550 feet in a north fork of Portage Creek.
Geology: Curtin, Karlson, O'Leary, Day, and McDanal (1978) report pan concentrate samples with visible gold from Quaternary gravels at this locality. The gold may have been derived from sources similar to those noted upstream from this locality. About one mile upstream at site TL007, chalcopyrite, pyrrhotite, arsenopyrite, molybdenite and pyrite with elevated gold values occur as joint coatings, in veins, and as disseminations adjacent to northwest-striking mineralized joint sets. In addition, altered granodiorite float located about 2 miles S72W contains gold-bearing veinlets of arsenopyrite and pyrite (TL063).
Workings: Reconnaissance mapping, stream silt and pan concentrate sampling by the U.S. Geological Survey (Reed and Elliott, 1970; Curtin, Karlson, O'Leary, Day, and McDanal, 1978; Reed and Nelson, 1980). Reconnaissance exploration has been conducted in the area by various private companies at various times during the 1970s and 1980s. Results from the exploration campaigns are not published.
Age: Pleistocene.
Commodities (Major) - Au
Development Status: No
Deposit Model: Placer Au-PGE (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
1 valid mineral.
Detailed Mineral List:
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
List of minerals for each chemical element
| Au | Gold | |
|---|---|---|
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | TL052 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell buried DomainDomain
- Farewell TerranePassive Margin
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