McGinnis Creek; Mansfield Gold Mine, Juneau Mining District, Juneau, Alaska, USAi
| Regional Level Types | |
|---|---|
| McGinnis Creek; Mansfield Gold Mine | Mine |
| Juneau Mining District | Mining District |
| Juneau | City Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
58° 26' 36'' North , 134° 38' 56'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Juneau | 32,756 (2017) | 20.6km |
Location: This placer mine is at an elevation of 500 feet on the east side of McGinnis Creek. It is 1.2 miles west of McGinnis Mountain, and 1 mile upstream from the mouth of Montana Creek. It is near the center of the NE1/4 section 35, T. 39 S., R. 65 E. of the Copper River Meridian. The location is accurate.
Geology: The McGinnis Creek placer deposit was discovered in 1897 and produced an unknown quantity of gold from 1897 to 1939 (Redman and others, 1989). Hydraulic machinery, a 1,000-foot flume, a 1,500-foot cable tram, and worker housing were constructed between 1903 and 1905. Gravels were sluiced with high-pressure giant water nozzles. The claims were patented in 1917 (Roehm, 1940). Bedrock consists of black phyllite and biotite schist. The phyllite contains quartz stringers that contain pyrite and up to 0.04 ounce of gold per ton (Redman and others, 1989).
Workings: The McGinnis Creek placer deposit was discovered in 1897 and produced an unknown quantity of gold from 1897 to 1939. Hydraulic machinery, a 1,000-foot flume, a 1,500-foot cable tram, and worker housing were constructed between 1903 and 1905. Gravels were sluiced with high-pressure giant water nozzles.
Age: Quaternary.
Production: The McGinnis Creek placer deposit was discovered in 1897 and produced an unknown quantity of gold from 1897 to 1939.
Commodities (Major) - Au
Development Status: Yes; small
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.
Gallery:
Other Databases
| Link to USGS - Alaska: | JU109 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Taku DomainDomain
- Yukon-TananaVolcanic Arc
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