Unnamed (on Flat Island)

Prospect, Undetermined

Commodities and mineralogy

Main commodities Au; Cu
Ore minerals chalcopyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CR
Quadrangle map, 1:63,360-scale A-3
Latitude 55.0906
Longitude -132.69376
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect reportedly is near the east shoreline of central Flat Island, in section 24, T. 78 S., R. 84 E.

Geologic setting

Geologic description

Bufvers (1967) reports that a rich quartz vein was found on the beach at this site, probably in the late 1880s. Too much powder was used to expose it and most of the gold was blasted into the water. A few thousand dollars in gold was said to have been recovered. Maas and others (1991) searched for this prospect without success, but did find several slightly mineralized quartz veins in the area. The best of these, a sample from Blanket Island with chalcopyrite in the quartz, contained 1,734 parts per million copper and no gold. The rocks in the area are basalt and andesite of Silurian or Ordovician age (Eberlein and others, 1983; Brew, 1996).
Geologic map unit (-132.695419534492, 55.0902506712496)
Mineral deposit model Gold-quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a
Age of mineralization Unknown other than that the prospect is in Silurian or Ordovician rocks.

Production and reserves

Workings or exploration Some gold was said to be have produced from unspecified, probably surface workings, probably in the 1880s.
Indication of production Yes; small
Reserve estimates None.
Production notes A few thousand dollars in gold (at $20.67 per ounce?) was said to have been recovered in the 1880s.

References