Unnamed Occurrence (ARDF - TN108; head of Blowback Creek), Hot Springs Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
| Regional Level Types | |
|---|---|
| Unnamed Occurrence (ARDF - TN108; head of Blowback Creek) | - not defined - |
| Hot Springs Mining District | Mining District |
| Yukon-Koyukuk Census Area | Census Area |
| Alaska | State |
| USA | Country |
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Latitude & Longitude (WGS84):
65° 2' 17'' North , 150° 43' 44'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This occurrence is at an elevation of about 1,500 feet on the toe of a northwest-trending ridge at the head of Blowback Creek, and approximately 1.1 miles northeast of Manley Hot Springs Dome. The site is at Alaska Division of Geological and Geophysical Surveys (ADGGS) sample station 97SL086 (Liss and others, 1998), near the southwest corner of section 36, T. 3 N., R. 16 W., of the Fairbanks Meridian. The location is accurate within 500 feet.
Geology: Bedrock at the head of Blowback Creek is mainly Lower Cretaceous sandstone, shale, and siltstone, along with less-abundantand quartzite (Reifenstuhl and others, 1998). The northwestern contact of the Tertiary Hot Springs granite pluton and its hornfels aureole is 3,000 feet to the south. A sample (97SL086) of quartzite with siderite collected by ADGGS on a ridge at the head of Blowback Creek contained 2,720 parts per billion (ppb) gold, 33.8 parts per milion (ppm) silver, 256 ppm arsenic, 480 ppm bismuth, 8,740 ppm copper, 3,400 ppm manganese, and more than 15 percent iron (Liss and others, 1998). There has been extensive exploration by industry around Hot Springs Dome and at the Barrett prospect (TN103).
Workings: A sample (97SL086) of quartzite with siderite collected by ADGGS on a ridge at the head of Blowback Creek contained 2,720 parts per billion (ppb) gold, 33.8 parts per milion (ppm) silver, 256 ppm arsenic, 480 ppm bismuth, 8,740 ppm copper, 3,400 ppm manganese, and more than 15 percent iron (Liss and others, 1998). There has been extensive exploration by industry around Hot Springs Dome and at the Barrett prospect (TN103).
Age: Tertiary. The granite has a [whole-rock?] K-Ar age date of 62 +/- 3 Ma (Chapman and others, 1982), and a biotite 40Ar/39Ar age date of 59 +/- 0.8 Ma (Reifenstuhl and others, 1998).
Commodities (Major) - Ag, Au, Cu; (Minor) - As, Bi, Fe, Mn
Development Status: None
Deposit Model: Polymetallic veins (Cox and Singer, 1986; model 22c).
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.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 5 - Nitrates and Carbonates | |||
|---|---|---|---|
| ⓘ | Siderite | 5.AB.05 | FeCO3 |
List of minerals for each chemical element
| C | Carbon | |
|---|---|---|
| C | ⓘ Siderite | FeCO3 |
| O | Oxygen | |
| O | ⓘ Siderite | FeCO3 |
| Fe | Iron | |
| Fe | ⓘ Siderite | FeCO3 |
Other Databases
| Link to USGS - Alaska: | TN108 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Arctic AlaskaPassive Margin
- Wickersham DomainDomain
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