Unnamed Prospect (ARDF - MH116; west side of Broxson Gulch), Delta River Mining District, Southeast Fairbanks Census Area, Alaska, USAi

Regional Level Types
Unnamed Prospect (ARDF - MH116; west side of Broxson Gulch)	- not defined -
Delta River Mining District	Mining District
Southeast Fairbanks Census Area	Census Area
Alaska	State
USA	Country

Location: This prospect is at an elevation of about 3,350 feet on the west side of the west fork of the stream(s) in Broxson Gulch, in the SW1/4SW1/4 section 26, T. 18 S., R. 8 E., Fairbanks Meridian. The occurrence corresponds to locality 43 in table 2 of Nokleberg and others (1991) and to locality 4 on figure 3 of Rose (1966 [ADMM GR 20]).
Geology: The rock at this prospect is Paleozoic (?) pyritic black phyllite of the Maclaren terrane (Nokleberg and others, 1991). The deposit was described by Rose (1966 [ADMM GR 20]) as a zone of limonite-cemented talus (ferricrete?) as much as 10 feet wide next to an old pit in black 'slate'. A sample of the limonitic material contained 1,000 parts per million (ppm) zinc, 375 ppm lead, 115 ppm copper, and 12 ppm molybdenum. Nokleberg and others (1991) collected samples of pyritic limonite-cemented breccia in black phyllite at probably the same site; their samples 79IL049-051 assayed 1,800 ppm zinc, 500 ppm cobalt, and 700 ppm yttrium (table 2, locality 43). The zinc values are high enough to suggest the presence of sphalerite or an oxidized zinc mineral.
Workings: An old pit does not appear to have reached the black phyllite bedrock. The prospect is on active MAN Resources claims.
Age: Unknown; possibly Paleozoic, the presumed age of the host rock.
Alteration: Oxidation of iron-bearing mineral(s).

Commodities (Major) - Zn; (Minor) - Co, Cu, Mo, Pb, Y
Development Status: None
Deposit Model: Unknown; the occurrence suggests a sedimentary-exhalative deposit.

Other Databases

Link to USGS - Alaska:	MH116

Other Regions, Features and Areas containing this locality

References