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Bobtail Creek Mine, Marshall Mining District, Kusilvak Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Bobtail Creek Mine | Mine |
| Marshall Mining District | Mining District |
| Kusilvak Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
61° 54' 39'' North , 161° 25' 8'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Russian Mission | 339 (2017) | 14.9km |
| Willow Creek | 212 (2010) | 28.1km |
Location: Bobtail Creek is a north tributary to Buster Creek (RM008), a west tributary to Kako Creek. These creeks are not named on the USGS 1:63,360 topographic map (1952 edition) of the area. The map site of the Bobtail Creek placer mine is 4.5 miles northwest of Kako Landing on the Yukon River. It is about 0.1 mile southwest of the center of sec. 17, T. 21 N., R. 66 W., of the Seward Meridian. This is locality 14 of Hoare and Cobb (1972, 1977).
Geology: Bobtail Creek was mostly mined by dragline in the 1930's. Mining took place from an elevation of about 220 feet,downstream for a distance of about 2,500 feet (Hickok and McAtee, 1990). The tailings gravel mostly comprise siltstone and shale, along with 10 percent or less chert, rhyolite, tuff, and andesite (Hickok and McAtee, 1990, p. 11). Joesting (1942) reported that rare cinnabar accompanies the placer gold. Hickok and McAtee (1990) estimated that 2,000 to 4,000 ounces of gold were recovered from Bobtail Creek and that reserves exist along and below the old tailings. Bobtail Creek heads on the ridge where the rhyolite-hosted Kako lode gold prospect (RM007) is located.
Workings: About 2,500 feet of dragline workings are present on Bobtail Creek.
Age: Quaternary.
Production: Hickok and McAtee (1990) estimate that 2 to 4 thousand ounces of gold were recovered from Bobtail Creek.
Reserves: Hickok and McAtee (1990, p. 11) conclude that reserves are present along and below the old tailings.
Commodities (Major) - Au; (Minor) - Hg
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.
Detailed Mineral List:
| ⓘ Cinnabar Formula: HgS |
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Cinnabar | 2.CD.15a | HgS |
List of minerals for each chemical element
| S | Sulfur | |
|---|---|---|
| S | ⓘ Cinnabar | HgS |
| Au | Gold | |
| Au | ⓘ Native Gold | Au |
| Hg | Mercury | |
| Hg | ⓘ Cinnabar | HgS |
Other Databases
| Link to USGS - Alaska: | RM009 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Koyukuk-Holycross DomainDomain
- Koyukuk ArcsVolcanic Arc
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