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

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

Location: Location plotted is locality 510 of Barker (1981, pl. A-3), on nose of spur ridge of Bear Mountain on west side of Galena Creek; known to within 500 ft (152.4 m).
Geology: Sphalerite and galena in widely scattered veins and replacements in hornfelsed and weakly propylitized siltstone, with subordinate greenstone and phyllite; sulfides present in 760 m by 1060 m area along ridge west of Galena Creek; more Zn than Pb in samples. Ag negligible; sulphides rare in phyllite, and malachite-staining common in greenstone. Older reports report presence of chalcopyrite in area. Geologic setting is structural dome containing Precambrian-Devonian siltstone, phyllite and greenstone which overly quartzite (possibly Neurokpuk Fm.) and are overlain by thick Devonian conglomerate (Kanayut and/or Kekiktuk Fm.) and Mississippian shale (Kayak Shale). Rocks intruded by Early Tertiary rhyolitic dikes; mineralization confined to greenstone-phyllite-siltstone unit; pyrite and Fe-oxides common along margins of rhyolite dikes (Barker, 1981, p. 33-40, 106-37).
Workings: High-grade sample 510 contains 24 ppm Cu, 13,000 ppm Pb, 35,000 ppm Zn, 2.7 ppm Ag, 10 ppm Mo; nearby samples 506-8 have up to 1000 ppm Cu, 2600 ppm Pb, 2600 ppm Zn, 0.6 ppm Ag, and 12 ppm Mo (Barker, 1981, p. 140).
Alteration: Weak propylitization.

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

Other Databases

Link to USGS - Alaska:	TB002

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References