Bonanza Creek prospect (Beef claims), Yukon Flats Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Bonanza Creek prospect (Beef claims)	Prospect
Yukon Flats Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: The reference point is located in the center of the Beef claim block, located about 12 miles NW of Dall Mountain in sec. 21, T21N, R11W, of the Fairbanks Meridian. Additional scattered mineral occurrences associated with this prospect are reported along a east-northeast trend through sections 20 through 23, T21N, R11W, of the Fairbanks Meridian, and a few somewhat more isolated occurrences in sections 27, 29, 30, and 32, T21N, R11W, of the Fairbanks Meridian. Location is accurate within ¼ mile radius.

Geology: Scheelite and molybdenite are reported to occur in modest amounts along the margin of the Kanuti batholith in the Bonanza Creek area (Clautice, 1983). The area studied includes a 30-square-mile project area which extends across the Beaver/Bettles quadrangle boundary. Scheelite is reported to occur most commonly as disseminated grains in a relatively sulfide-free pyroxene-garnet skarn and on fracture surfaces in calc-silicate schist, and less commonly in quartz veins. Molybdenite occurs typically as rosettes and small flakes in quartz veins associated with biotite quartz monzonite and less commonly in similar fashion with aplites, pegmatites, and calc-silicate rocks. Grab samples have returned values as high as 0.89 percent W, 300 grams Ag per ton, and 0.65 percent Cu. The granite pluton portion of the Kanuti batholith gave a K-Ar age of 90.6 Ma.

Workings: Some limited trenching in the area, but most of the exploration work has been just west of the Beaver quadrangle boundary.

Age: Associated granite pluton is part of the Kanuti batholith, which has a K-Ar age date of 90.6 Ma (Nokleberg and others, 1987).

Alteration: Calc-silicate skarn.

Commodities (Major): Mo, W; (Minor) - Cu

Development Status: None

Deposit Model: W skarn deposit (Cox and Singer, 1986; model 14a)

Other Databases

Link to USGS - Alaska:	BV003

Other Regions, Features and Areas containing this locality

References