Black Bart Prospect, Hot Springs Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Black Bart Prospect	Prospect
Hot Springs Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: The Black Bart lode claims were staked in 1978 at the head of Eureka Creek (Alaska Kardex files). Mining claim location notices show 2 claims in section 25, T. 5 N, R. 13 W. and section 30, T. 5 N, R. 12 W., of the Fairbanks Meridian. For this record, the site is in the northwest quarter of section 30, T. 5 N., R. 12 W., of the Fairbanks Meridian. The location is accurate within about 1500 feet. This site closely corresponds with the site for Black Bart, U.S. Bureau of Land Management MAS number 0020480119.
Geology: The bedrock in most of the upper reaches of Eureka Creek is Jurassic or Cretaceous sandstone, siltstone, shale, and quartzite (Chapman and others, 1982; Reifenstuhl and others, 1998). Some of the strata are intruded by several northeast-trending, Cretaceous monzodiorite plugs. The creek follows a southwest-trending thrust fault for four miles. This fault is manifested by the valley's asymmetry. The southeast side is very steep, and consists of quartzite, while 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 to the 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). The mining location notice shows that the claim was staked on a northwest-trending dike crossed by the Eureka-Rampart road. The vein exposure, or possibly trench dimensions, is described as 2 feet wide, 12 feet high, and 6 feet deep. The ore mineralogy and commodities sought are not described. No other work is known on this prospect.
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 to the 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). The mining location notice shows that the claim was staked on a northwest-trending dike crossed by the Eureka-Rampart road. The vein exposure, or possibly trench dimensions, is described as 2 feet wide, 12 feet high, and 6 feet deep. The ore mineralogy and commodities sought are not described. No other work is known on this prospect.
Development Status: None
Deposit Model: Polymetallic vein(?) (Cox and Singer, 1986; model 22c).

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Link to USGS - Alaska:	TN136

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References