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Ruby Creek Mine, Eagle Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Ruby Creek Mine | Mine |
| Eagle Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
65° 17' 23'' North , 143° 9' 36'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
See also Fourth of July Creek (CY015). This site is within the Yukon-Charley Rivers National Preserve.
Location: Ruby Creek is a northeast-flowing tributary of Fourth of July Creek (CY015). It is location 7 of Cobb (1972 [MF-390]). The deposit is located midway up Ruby Creek, about a mile from its head. The placer mining occurs just upstream of the confluence with an unnamed creek entering from the southeast, in section 4, T. 3 N., R. 28 E., of the Fairbanks Meridian. The location is accurate to within one mile.
Geology: The bedrock of Ruby Creek is composed of Cretaceous to Tertiary conglomerate and other sedimentary rocks (Dover and Miyaoka, 1988). The placer gold is found in the 20 inches of gravel above bedrock; bedrock was 12 to 15 feet from the surface in 1912 (Prindle and Mertie, 1912). The creek was first mined in the early 1900s. Mining was by open-cut methods because the bedrock was less than 15 feet below the surface. Values of $50 to $75 per 12-foot by 12-foot sluice box were reported in the early 1900s (1901-1910 dollars). Mining operations were frequently constrained by a lack of water. In 1926, production was 5 ounces of gold and one ounce of silver (National Park Service, 1990).
Workings: The creek was first mined in the early 1900s, but more mining activity occurred in 1911. Mining was by open-cut methods because the bedrock was less than 15 feet below the surface. Mining operations were frequently constrained by a lack of water (National Park Service, 1990).
Age: Quaternary.
Production: In 1926, production was 5 ounces of gold and one ounce of silver (National Park Service, 1990). Values of $50 to $75 per 12-foot by 12-foot sluice box were reported in the early 1900s.
Commodities (Major) - Au; (Minor) - Ag
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
2 valid minerals.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Gold | 1.AA.05 | Au |
| ⓘ | Silver | 1.AA.05 | Ag |
Other Databases
| Link to USGS - Alaska: | CY026 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Arctic AlaskaPassive Margin
- Porcupine DomainDomain
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