Black Creek Mine, Hughes Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Black Creek Mine | Mine |
| Hughes Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
66° 5' 3'' North , 153° 50' 49'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Location: The Black Creek placer mine is about 4.5 miles west-northwest of the summit of Indian Mountain. The creek flows northeast for about 2 miles where it joins the Indian River. The area of placer mining on Black Creek extends for about 0.8 miles above its mouth. The coordinates are near the midpoint of placer mining. The location is accurate. May be the same as Synder Creek (See HU024).
Geology: Placer mining began on Black Creek about 1913. The gold-bearing gravels are about 12 feet wide and the depth to bedrock about 20 feet. Eakin (1915) reports that the bedrock is altered Mesozoic strata near a granite pluton. According to Miller and Ferrians (1968), Black Creek flows over the contact between Cretaceous graywacke and mudstone, and Cretaceous granodiorite and quartz monzonite. Eberlein and others (1977) speculate that the gold is probably derived from this contact zone. The graywacke and mudstone have been hornfelsed by the intrusive. Gold panned from the upper reaches of Black Creek is coarse and angular (Miller and Ferrians, 1968). Kurtak and others (1999) collected samples of gravel overlying hornfels bedrock along upper Black Creek. The gravel contains up to 0.84 ounce of gold per cubic yard, 813 ppm arsenic, and more than 2,000 ppm tungsten. According to Kurtak and others (2002), the placer resource is small. The gold-bearing gravels on Black Creek are finer than those on Indian River (HU024), which contain many boulders.
Workings: Surface mining.
Age: Quaternary.
Alteration: Eakin (1915) noted altered bedrock but did not describe the alteration.
Production: Incomplete records indicate that from 1914 through 1942, at least 1,352 ounces of gold were produced from Black Creek (Kurtak and others, 2002).
Commodities (Major) - Au; (Minor) - W
Development Status: Yes
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:
| ⓘ Native Gold Formula: Au |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Native Gold | 1.AA.05 | Au |
List of minerals for each chemical element
| Au | Gold | |
|---|---|---|
| Au | ⓘ Native Gold | Au |
Other Databases
| Link to USGS - Alaska: | HU022 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Koyukuk-Indian Mountain DomainDomain
- Koyukuk ArcsVolcanic Arc
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