Straight Creek Springs Occurrence, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Straight Creek Springs Occurrence | Occurrence |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
62° 10' 12'' North , 154° 23' 16'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
The gossan occurs in the same stratigarphic position as exists in the Crash (MG049) and Dahl (MG053) prospects in the 'Farewell mineral belt'.
Location: Straight Creek Springs (more than a dozen distinct springs are known) are located on the west limit of Straight Creek valley just down stream from the Chip Loy deposit (MG032). The springs occur at an elevation of 2,800 feet (853 m) in the W1/2 sec. 15, T. 24 N., R. 28 W., of the Seward Meridian. The coordinates are in the center of the spring system. The reporter visited the site in 1998.
Geology: Straight Creek Springs consist of a very distinctive, north-south trending, 400-meter-long line of more than a dozen active springs, each containing conspicuous coatings and replacements of brilliant orange limonite and light gray, bleached, silicrete crusts up to 3 centimeters thick. The conspicuous orange-light gray colored springs occur immediately below the contact between the black shale-rich section of the Ordovician-Lower Silurian, Post River Formation and the mid to Late Silurian Terra Cotta Mountains Sandstone, both of lower Paleozoic age (Churkin and Carter, 1996; Bundtzen, Harris, and Gilbert, 1997). The springs may indicate a concealed mineralized source in the black shale section. Herreid (1968) and T.K. Bundtzen and G.M. Laird (written communications, 1998) report that samples of silicrete-limonite material from two of the springs contain up to 125 ppm copper, 270 ppm zinc, 400 ppm nickel, and 10 ppm molybdenum.
Workings: The Straight Creek Springs were first described by Herreid (1968). Herreid (1968) and T.K. Bundtzen and G.M. Laird (written communication, 1998) report that samples of silicrete-limonite material from three of the springs contain up to 125 ppm copper, 270 ppm zinc, 400 ppm nickel, and 10 ppm molydenum.
Age: Quaternary.
Alteration: Silicrete-limonite.
Reserves: None.
Commodities (Major) - Cu, Ni, Zn; (Minor) - Mo
Development Status: No
Deposit Model: Unknown; anomalous values are apparently derived from Ordovician-Silurian black
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
Detailed Mineral List:
| ⓘ 'Limonite' |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Unclassified | |||
|---|---|---|---|
| ⓘ | 'Limonite' | - | |
List of minerals for each chemical element
Other Databases
| Link to USGS - Alaska: | MG031 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Farewell-McGrath DomainDomain
- Farewell TerranePassive Margin
USA
- Alaska
- Yukon-Koyukuk Census Area
- McGrath Mining DistrictMining District
- Yukon-Koyukuk Census Area
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