Portage Creek Occurrence, Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Portage Creek Occurrence | Occurrence |
| Valdez Creek Mining District | Mining District |
| Matanuska-Susitna Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 54' 39'' North , 149° 12' 28'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Cantwell | 219 (2011) | 55.0km |
MAS/MIL number 20760108.
Location: This placer occurrence is located on Portage Creek just below its junction with Thoroughfare Creek The placer extends for about 2 miles, from the SE1/4 sec. 25 to the the SE1/4 sec. 34, T. 33 N., R. 1 E., Seward Meridian. The coordinates are near the midpoint of the occurrence and is accurate to within 1/2 mile. This is locality D18 of Kurtak and others (1992).
Geology: Bedrock in the area of this occurrence consists of Jurassic to Cretaceous flysch and argillite, lithic graywacke, conglomerate, with minor chert and limestone (Csejtey and others, 1978). Tertiary intrusions also occur in the drainage area. The upper Portage Creek area is marked by up to 3-mile-wide alluvial deposits and by widespread glacial cover (Kurtak and others, 1992). Gold occurs locally in the alluvial gravel. Placer samples collected in 1988 by the U.S. Bureau of Mines contain up to 0.002 ounce of gold per cubic yard (Kurtak and others, 1992).
Workings: Placer sampling by U.S. Bureau of Mines (Kurtak and others, 1992).
Age: Quaternary.
Commodities (Major) - Au
Development Status: None
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
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: | TK015 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Chulitna-Broad Pass DomainDomain
- Yukon-TananaVolcanic Arc
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