Occurrence, Probably inactive

Commodities and mineralogy

Main commodities Cu; Pb; Zn
Ore minerals arsenopyrite; bornite; chalcopyrite; galena; magnetite; and sphalerite.
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale PE
Quadrangle map, 1:63,360-scale B-3
Latitude 56.374
Longitude -132.917
Nearby scientific data Find additional scientific data near this location
Location and accuracy Location known exactly and easily found; deposit exposed in a rock quarry adjacent to a logging road on central Zarembo Island. Site in the SW1/4, section 27, T. 63 S., R. 80 E. Locality 63 of Grybeck, Berg, and Karl (1984).

Geologic setting

Geologic description

The country rock is a Tertiary alkalic granite well exposed in a rock quarry; the intrusive is cut by spherulitic felsic dikes which are in turn cut by andesite dikes (Brew, 1997 [OF 97-156-E]).
The mineralization consists of quartz veinlets and lenses an inch or so thick in an altered shear zone about 4 feet wide that cuts the granite. The quartz vein material contains a few percent of ore minerals including chalcopyrite, bornite, galena, sphalerite, arsenopyrite, and magnetite. Analysis of a selected high-grade grab sample show major Pb, Zn, and Cu consistent with the hand-specimen mineralogy, less than 0.005 ppm Au, up to 50 ppm Ag, up to 15 ppm Sn, and up to 3 ppm W. The exposure of the vein is small but could indicate more vein-type mineralization in the area.
Geologic map unit (-132.918714105562, 56.3736518947083)
Mineral deposit model Polymetallic vein along shear zone (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Tertiary or younger.

Production and reserves

Workings or exploration Occurrence first found by the USGS in the late 70s in a quarry excavated for road metal. To 1996, no obvious signs or published descriptions of other work at the site.
Indication of production None
Reserve estimates None
Production notes None