Unnamed Prospect (ARDF - PS008; west of the Middle Fork Chandalar River), Chandalar Mining District, North Slope Borough, Alaska, USAi

Regional Level Types
Unnamed Prospect (ARDF - PS008; west of the Middle Fork Chandalar River)	- not defined -
Chandalar Mining District	Mining District
North Slope Borough	Borough
Alaska	State
USA	Country

See also locations PS006 and PS007. Site is in an area of potential carbonate-hosted lead-zinc deposits (Menzie and others, 1985).
Location: Site is at approximately 3,850 ft., about 4 1/2 miles west of the Middle Fork Chandalar River and about 8 miles south-southwest of the confluence of Beaucoup Creek and Middle Fork Chandalar River (west-center sec. 25, T. 16 S., R. 18 E., of the Umiat Meridian). The site corresponds to sample No. 76 ARR 47 shown in Detra (1977, fig. 1). Location accurate within 1/4-mile radius.
Geology: Visible sphalerite and galena occur in a Cu-stained and quartz-veined chert (Menzie and others, 1985). The occurrence is at the upper contact zone of Devonian - Silurian(?) Skajit Limestone with overlying shales, sandstones and conglomerates of the Devonian Hunt Fork Shale and Beaucoup Formation. The chert occurs locally along this contact. The upper contact of the Skajit in this location is an unconformity that has been interpreted as a paleokarst surface. Analysis of a sample of the mineralization from this occurrence returned values of 2 percent Pb, 0.5 to 1percent Zn, [more than] 0.5percent Ba and 30 ppm Ag (Detra, 1977).
Workings: One block of 15 lode claims staked by RAA in 1977. Semi-quantitative spectrographic data from a rock sample (sample number 76 ARR 47) from the site gave the following values: Ag (30 ppm), Ba (greater than 5,000 ppm), Cd (70 ppm), Cu (1,000 ppm), Pb (20,000 ppm), Sb (300 ppm), Zn (10,000 ppm). Zn by wet chemical analysis - 5,000 ppm (Detra, 1977, table 1).

Commodities (Major) - Pb, Zn; (Minor) - Ag(?), Cu(?)
Development Status: None
Deposit Model: Mississippi Valley Zn-Pb (?) (Cox and Singer, 1986; model 32a).

Other Databases

Link to USGS - Alaska:	PS008

Other Regions, Features and Areas containing this locality

References