Sweeper Cove

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities Cu; Pb; Zn
Ore minerals galena; sphalerite
Gangue minerals pyrite; quartz

Geographic location

Quadrangle map, 1:250,000-scale AD
Quadrangle map, 1:63,360-scale C-2
Latitude 51.8478
Longitude -176.6439
Nearby scientific data Find additional scientific data near this location
Location and accuracy Locality described as quarry on hill one half mile southwest of head of Sweeper Cove. U.S. Geological Survey field work in 1993 confirmed location in large quarry. Accurate within a few hundred meters.

Geologic setting

Geologic description

Highly pyritized contact between a dioritic intrusion and country rock (Coats,1956). Country rock is mildly altered and metamorphosed volcanic rocks of the Finger Bay Volcanics. Near the contact between the Finger Bay Volcanics and the dioritic intrusion is a quartz vein containing galena and sphalerite(?).
Geologic map unit (-176.646371095396, 51.8464211583552)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Age of mineralization Tertiary.
Alteration of deposit Strong pyritization obscures contact according to Coats (1956), however examination in 1993 did not confirm this.

Production and reserves

Workings or exploration Assay of pyritic rocks showed negligible gold and silver (Coats, 1956). Sampling of vein in 1993 yielded 300 ppb Au, 15 ppm Ag, 100 ppm Cu, 300 ppm Pb, and 700 ppm Zn (sample 93 TL 106).
Indication of production None


MRDS Number A106031
Reporters F.H. Wilson, T.D. Light
Last report date 2/22/1996