Lewis Pond

Overview

Minimum tonnage 7.2 million t @ 0.12% Cu, 3.5% Zn, 1.73% Pb, 1.87 g/t Au, 95 g/t Ag. Massive, semi-massive, disseminated sulfide lenses, 1.3 km strike length, 200 m width. Elongate zone of stringer Cu 2 km x 700 m. Main zone and Toms zone are at two separate stratigraphic levels. Main zone has 3 subparallel lenses, 300 m total strike length, 650 m down-plunge, open at depth. Central lens is 100 to 500 m below surface, averages 15 m in horizontal thickness. Hanging wall lens averages 4 m in horizontal thickness. Footwall lens averages 18 m in horizontal thickness, 150 to 500 m below surface. Toms zone is 900 m along strike from the Main zone. 250 m strike length, from the surface down to 500 m depth, averages 5 m horizontal thickness. Open in all directions. Footwall stringer is 2 km x 700 m in area of quartz-chlorite-chalcopyrite veins.

Geological Context

Tectonic Setting: Siliciclastic-felsic in mature epicontinental arc

Resources & Operations

Production Start: 1887

Data Provenance

Source: USGS MRDS