Unnamed Occurrence (ARDF - MH132; southeast headwaters of the east fork in Broxson Gulch), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - MH132; southeast headwaters of the east fork in Broxson Gulch)	- not defined -
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This occurrence is at an elevation of about 5,000 feet in the southeast headwaters of the locally named east fork in Broxson Gulch (Rose, 1965, figure 2), in the SW1/4SW1/4 section 22, T. 18 S., R. 9 E., Fairbanks Meridian. This occurrence corresponds to locality 16 on figure 2 of Rose (1965), locality 22 of MacKevett and Holloway (1977), and locality 58 in table 2 of Nokleberg and others (1991).
Geology: The rocks in the area of this occurrence are carbonate strata of the Slana Spur Formation of Pennsylvanian and Permian age (Nokleberg and others, 1991). The strata are cut by Upper Triassic gabbro dikes. The mineral deposits are skarn bodies as much as 3 feet thick that both parallel and intersect the bedding of the strata adjacent to the gabbro dikes. The skarn is composed mainly of clinopyroxene, garnet, and magnetite and contains small amounts of pyrite, chalcopyrite, and pyrrhotite. Sample 79NK225C of copper-bearing skarn assayed 5.6 percent copper, 1.2 parts per million (ppm) gold, 300 ppm silver, and 720 ppm zinc (Nokleberg and others, 1991).
Workings: The occurrence is on active MAN Resources claims.
Age: Late Triassic, the age of the host rock.
Alteration: The skarn is dark green and consists chiefly of clinopyroxene, garnet, and magnetite and small amounts of glaucophane, biotite, calcite, pyrite, chalcopyrite and, locally, pyrrhotite (Rose, 1965).

Commodities (Major) - Ag, Au, Cu; (Minor) - Zn
Development Status: None
Deposit Model: Skarn related to gabbro dikes.

Other Databases

Link to USGS - Alaska:	MH132

Other Regions, Features and Areas containing this locality

References