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Galena Creek-West

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu; Pb; Zn
Ore minerals chalcopyrite; galena; malachite; sphalerite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TB
Quadrangle map, 1:63,360-scale B-2
Latitude 68.38
Longitude -142.037
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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).

Geologic setting

Geologic description

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; sulfides 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).
Geologic map unit (-142.039721949813, 68.3797676589059)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit Weak propylitization.

Production and reserves

Workings or exploration 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).
Indication of production None

References

MRDS Number A012546

References

Grybeck, Donald, 1977, Map showing known mineral deposits of the Brooks Range, Alaska: U.S. Geological Survey Open-File Report 77-166-C, 45 p., 1 sheet, scale 1:1,000,000.
U.S. Geological Survey, 1977, Geological Survey research, 1977: U.S. Geological Survey Professional Paper 1050, 411 p.
Reporters K.R. Leonard; D.F. Huber; J.M. Schmidt ; J.H. Dover
Last report date 9/20/1996