Rosie Creek; Rose Creek; Lake Creek Prospects, Koyukuk Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Rosie Creek; Rose Creek; Lake Creek Prospects | Group of Prospects |
| Koyukuk Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
67° 11' 41'' North , 150° 11' 20'' West
Latitude & Longitude (decimal):
Type:
Group of Prospects
Köppen climate type:
Location: Rosie Creek flows north from Rosie Creek Pass, along the east side of Cathedral Mountain. The creek turns west along its lower course, and enters the Middle Fork, Koyukuk River about 2 miles northeast of the mouth of Twelvemile Creek. About 3 miles east of its mouth, Rosie Creek is joined by an unnamed (on the A-1 topographic map) southerly-flowing tributary called Lake Creek by Reed (1938). The coordinates are at the junction of Rosie Creek and Lake Creek. Prospects are located on Lake Creek upstream for a distance of about 2 miles, and downstream on Rosie Creek for about a mile. The location is accurate within one mile.
Geology: A number of prospect shafts were sunk in the early 1900's on Rosie Creek and its tributary Lake Creek (Reed, 1938). The depth to bedrock varies from just over 100 feet to as much as 275 feet in one shaft near the head of Lake Creek. Maddren (1913) reported fine gold in surface gravels about 2 miles above the mouth of Rose(sic) Creek, and that a 113-foot shaft near the junction of Rose Creek and Lake Creek worked a thin layer of gravel on bedrock that produced numerous fine flakes of gold. Reed (1938) described several additional shafts from near the head of Lake Creek to about 0.2 mile below the junction of Rosie and Lake Creeks. Only the shafts on Lake Creek found any gold. This was fine flour gold, which occurred throughout the gravels from a depth of 20 feet to the top of the bedrock . Reed (1938) reported that the bedrock on Rosie Creek is greenstone and the bedrock on Lake Creek is schist. According to Dillon and others (1986), Rosie Creek is underlain by metagraywacke and phyllite, and upper Lake Creek is underlain by schist of the Hunt Fork Formation.
Workings: Prospect shafts.
Age: Quaternary.
Commodities (Major) - Au
Development Status: None
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)
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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:
Other Databases
| Link to USGS - Alaska: | WI151 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Brooks RangeMountain Range
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Brooks Range DomainVolcanic Arc
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