Unnamed Occurrence (ARDF - TN138; Pioneer Creek Headwater; Eureka Head), Hot Springs Mining District, Yukon-Koyukuk Census Area, Alaska, USAi
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Latitude & Longitude (WGS84):
65° 14' 48'' North , 150° 4' 15'' West
Latitude & Longitude (decimal):
Köppen climate type:
Location: This lode occurrence is at an elevation of 2,000 feet, in the northwest quarter of section 20, T. 5 N., R. 12 W., of the Fairbanks Meridian. The location is accurate within 1000 feet. This site closely corresponds to the U.S. Bureau of Land Management site for Pioneer Creek Headwater (MAS number 0020480118). The site for Eureka Head (MAS number 0020480051) probably is the same lode occurrence. The site roughly corresponds to location 9 of Cobb (1972, 1977).
Geology: Bedrock in most of the upper reaches of Eureka Creek consists of Jurassic or Cretaceous sandstone, siltstone, shale, and quartzite (Chapman and others, 1982; Reifenstuhl and others, 1998). Some of the strata are intruded by several small, northeast-trending, Cretaceous monzodiorite plugs. The creek follows a southwest-trending thrust fault for four miles. The fault is manifested by the valley's asymmetry: the southeast side is very steep, and consists of quartzite; the northwest side, along which the placer benches occur, slopes gently. Mertie (1934) reported that a prospector had found a lead-silver deposit several years before 1931 in the headwaters of either Eureka or Pioneer creeks. Two assays of the sulfides are said to have shown 100 ounces of silver per ton and 70 percent lead. A lode claim was located on this site in 1978, with hand trenching and blasting from 1979 to 1981 to expose the ore (Alaska Kardex files). No other work on this prospect is known.
Workings: Mertie (1934) reported that a prospector had found a lead-silver deposit several years before 1931 in the headwaters of either Eureka or Pioneer creeks. Two assays of the sulfides are said to have shown 100 ounces of silver per ton and 70 percent lead. A lode claim was located on this site in 1978, with hand trenching and blasting from 1979 to 1981 to expose the ore (Alaska Kardex files). No other work on this prospect is known.
Commodities (Major) - Ag, Pb
Development Status: None
Deposit Model: Polymetallic vein(?) (Cox and Singer, 1986; model 22c).
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.List of minerals for each chemical element
Other Databases
| Link to USGS - Alaska: | TN138 |
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Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Arctic AlaskaPassive Margin
- Wickersham DomainDomain
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