Unnamed Occurrence (ARDF - TK103; south tributary to Black River), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi
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Latitude & Longitude (WGS84):
62° 19' 53'' North , 147° 54' 28'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This placer occurrence is at an elevation of about 5,000 feet on an unnamed, north-flowing tributary of Black River, about 4 1/2 miles south of Black Lake. The placer is at the creek junction in the NE1/4 sec. 23, T. 26 N., R. 8 E., Seward Meridian. The location is accurate.
Geology: This occurrence consists of placer gold and abundant garnet in pan concentrate samples from 2 forks at a stream junction (Clautice and others, 1990). A sample on the east fork contains 4,800 parts per billion gold, and at least 5 colors in the pan; a sample from the west fork contains more than 10,000 parts per billion ppb gold (or about 0.302 ounce of gold per ton) and abundant visible gold. The bedrock is Tertiary conglomerate cemented by limonite and hematite. A sample of the conglomerate did not contain anomalous metal values.
Workings: Only limited sampling (Clautice and others, 1990).
Age: Quaternary placer.
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:
| ⓘ 'Garnet Group' Formula: X3Z2(SiO4)3 |
| ⓘ Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| Unclassified | |||
| ⓘ | 'Garnet Group' | - | X3Z2(SiO4)3 |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Garnet Group | X3Z2(SiO4)3 |
| Si | Silicon | |
| Si | ⓘ Garnet Group | X3Z2(SiO4)3 |
| Au | Gold | |
| Au | ⓘ Gold | Au |
Other Databases
| Link to USGS - Alaska: | TK103 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Peninsular-Talkeetna DomainDomain
- Peninsular TerraneVolcanic Arc
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