Beaver Prospect, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Beaver Prospect	Prospect
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

See Bermuda (MD045), Hillside (MD049), and Big Gate (MD050) Mississippi Valley Type occurrences in Medfra B-3 quadrangle.
Location: The Beaver prospect is located on a south-facing slope at 1,950 feet (595 m) in elevation, upslope from the West Fork of Beaver Creek in Section 6, T. 24 S., R. 25 E., of the Kateel River Meridian. Location is known within 100 feet (30 m).
Geology: At the Beaver prospect, mineralized rubble covers a 400 feet by 100 feet (122 m by 30 m) area in a sheet of gray dolomite of the Paradise Fork Formation of Dutro and Patton (1982). Smithsonite-rich, cerrusite-galena zones occur in well developed solution breccias, especially in recrystallized white, vuggy dolomite. Host unit trends N 45 E and dips 45 degrees South. Beaver is considered the best of a series of Mississippi Valley Type deposits exposed on the north limb of the Beaver Creek syncline. Other related deposits include Big Gate (MD050), Hillside (MD049), and Bermuda (MD045) showings. Host rock is Ordovician-Silurian, based on fossils in host unit (Blodgett, 1982); however, the age of the mineralization is unknown. Grab samples from cerussite-rich gossan contain up to 32.7 percent zinc and 34.5 percent lead. A continuous trench sample that was composed of about 80 percent gossan contained 19.25 percent zinc and 0.90 percent lead over a 40 feet (12 m) interval (Schmidt, 1997).
Workings: The Beaver prospect was discovered by WGM Inc. and Patino Ltd. during exploration for base metals on lands in the 'Reef Ridge district.' Sporadic surface investigations were continued by Pasminco Ltd. until about 1989. Grab samples from cerussite-rich gossan contain up to 32.7 percent zinc and 34.5 percent lead. A continuous trench sample that was composed of about 80 percent gossan contained 19.25 percent zinc and 0.90 percent lead over a 40 feet (12 m) channel interval (Schmidt, 1997).
Age: Host rock is Ordovician-Silurian, based on fossils in host unit (Blodgett, 1982); however, the age of the mineralization is unknown.
Alteration: White vuggy dolomite; galena to oxidized cerrusite.
Reserves: None.

Commodities (Major) - Zn; (Minor) - Pb
Development Status: No
Deposit Model: Southeast Missouri Pb-Zn (Cox and singer, 1986; model no. 32a) or Mississippi V

Other Databases

Link to USGS - Alaska:	MD048

Other Regions, Features and Areas containing this locality

References