Boat Harbor

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au; Cu; Zn
Other commodities Hg; Pb
Ore minerals azurite; chalcopyrite; galena; malachite; sphalerite
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale AD
Quadrangle map, 1:63,360-scale C-2
Latitude 51.8508
Longitude -176.6483
Nearby scientific data Find additional scientific data near this location
Location and accuracy Quarry across road from small boat harbor at Sweeper Cove. Location accurate with about 100 m.

Geologic setting

Geologic description

Volcanic breccias of the Finger Bay Volcanics are cut by a shear or fault zone, exposed in quarry. Zone is filled by quartz vein carrying abundant sulfide minerals, including chalcopyrite. Malachite/azurite staining coasts surrounding rocks. Epidote veins and segregations are common in vicinity of vein. One float boulder of epidote was 30 cm in diameter.
Geologic map unit (-176.650771723236, 51.8494210189317)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Tertiary.
Alteration of deposit Silicification and epidote replacement of country rocks.

Production and reserves

Workings or exploration Sampling of the vein during brief U.S. Geological Survey field work in 1993 yielded 100 ppb Au, 0.12 ppm Hg, 14 ppm Ag, 4,700 ppm Cu, 3,700 ppm Zn and 110 ppm Pb (sample 93AWs16). A mineralized sample of the volcanic breccia yielded 50 ppb Au, 11 ppm Ag, 4,700 ppm Cu, and 4,000 ppm Zn (sample 93 AWs 16b).
Indication of production None

References

MRDS Number A106040
Reporters F.H. Wilson, T.D. Light
Last report date 2/22/1996