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Homestake Creek; Platte Creek Mine, Bonnifield Mining District, Denali Borough, Alaska, USAi
| Regional Level Types | |
|---|---|
| Homestake Creek; Platte Creek Mine | Mine |
| Bonnifield Mining District | Mining District |
| Denali Borough | Borough |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
63° 58' 11'' North , 148° 33' 36'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Healy | 1,021 (2018) | 23.5km |
| McKinley Park | 185 (2014) | 31.5km |
The stream gradient in Platte Creek is 100 feet per mile; in Homestake Creek it is 200 feet per mile.
Location: Gold placer mining activity has taken place for at least 2 miles along Homestake Creek and its upstream continuation Platte Creek. The map site is in sec. 5, T. 11 S., R. 5 W., of the Fairbanks Meridian. This is location 57 of Clark and Cobb (1972).
Geology: Upper Platte Creek drains en Eocene to Miocene sequence of poorly consolidated pebbly sandstone, claystone, and sub-bituminous coal (Wilson and others, 1998). Lower Platte Creek to its junction with Fox Creek drains schist of the Keevy Peak Formation, which is intruded by Tertiary hypabyssal granitic rocks. The workings at Platte Creek are in well-sorted and rounded gravels 3 to 6 feet thick. Most of the gold is in the lower 2 to 3 feet of the gravel and upper part of schist bedrock. Paystreaks 25 to 60 feet wide were reported (Cobb, 1973: B1374). In Homestake Creek, the gravels are coarse and poorly sorted and contain abundant cobble and boulder-sized clasts that include large angular blocks of andesite. The gravels in Platte Creek were reported to carry 0.14 ounce of gold per cubic yard. Gravels on bedrock downstream contained 0.14 to 0.43 ounce of gold per cubic yard (Capps, 1912). The most probable sources of the placer gold are Tertiary paleoplacers formed during an earlier erosional cycle of the Alaska Range.
Workings: Surface only. The gravels in Platte Creek were reported to carry 0.14 ounce of gold per cubic yard. Gravels on bedrock downstream contained 0.14 to 0.43 ounce of gold per cubic yard (Capps, 1912).
Age: Quaternary.
Production: Most of the production occurred before 1912.
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.
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: | HE005 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Nenana BasinBasin
- North America PlatformPassive Margin
- Yukon-Tanana lower DomainDomain
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