Galena Creek - East Occurrence, Sheenjek Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Galena Creek - East Occurrence	Occurrence
Sheenjek Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: Location plotted is locality 502 of Barker (1981, pl. A-3), from which massive galena and barite samples were taken during 1977 USBM field work; near crestline of Bear Mountain ridge on east side of Galena Creek; known to within 500 ft (152.4 m).
Geology: Well-defined northwest-trending quartz vein system about 6.5 ft (2 m) wide by 1500 ft (454 m) long, contains massive galena, malachite and barite; altered calcareous siltstone host rock contains minor disseminated galena and malachite. Vein contains up to 21% Cu, though malachite is the only Cu mineral noted in more recent reports; older reports list presence of chalcopyrite in greenstone in general vicinity. Geologic setting is structural dome containing Precambrian-Devonian siltstone, phyllite and greenstone which overlie quartzite (possibly Neurokpuk Fm.) and are overlain by thick Devonian conglomerate (Kanayut and/or Kekiktuk Fm.) and Mississippian shale (Kayak Shale). Siltstone more calcareous and less hornfelsed, and has more associated greenstone than bedrock west of Galena Cr. (TB002), and has more intense but less widespread propylitic alteration. Vein system follows contact with underlying massive white quartzite (Barker, 1981, p. 33-40, 106-137).
Workings: Rock sample 2502 has massive galena and barite, and contains 21% Cu, 1.2% Pb, 5500 ppm Zn, 170 ppm Ag, and 33 ppm Mo, nearby samples 2511 and 2512 have up to 10.3% Cu, 1.1% Pb, 1200 ppm Zn, 3.3 ppm Ag, and 22 ppm Mo (Barker, 1981, p. 140).
Alteration: Intensely propylitized locally

Commodities (Major) - Pb, Ag, Cu, Ba
Development Status: No
Deposit Model: Lode; polymetallic vein

Other Databases

Link to USGS - Alaska:	TB001

Other Regions, Features and Areas containing this locality

References