Geology of the Cowichan Lake Area BCMEMPR Open File 1987-02
Table of Contents
Open File 1987-2 consists of a set of maps that depict the geology, stratigraphy and structure of the Cowichan Lake area (092C/16) of southern Vancouver Island, British Columbia. The northern half of the map is underlain by Paleozoic Sicker Group rocks in a thrust-sliced geanticlinal uplift. These rocks have potential for Kuroko-style polymetallic massive sulphide deposits. Limestone in both Sicker Group and Quatsino Formation has been exploited for cement elsewhere on the Island. There is also exploration potential for the industrial mineral commodity manganese, mainly in rhodonite.
Mesozoic strata of the Vancouver and Bonanza Groups underlie the southern half of the area. The latter shows potential for epithermal gold-silver deposits associated with high-level intrusives. Island intrusive rocks also have copper-molybdenum porphyry potential.
Limestone is found in both the Sicker Group and the Vancouver Group, and copper skarns occur where the limestones are cut by Jurassic Island intrusives. Gold-bearing quartz-carbonate veins are related to shear zones across both Sicker Group rocks and Karmutsen Formation sills north of Cowichan Lake.
The Open File comprises one 1:50 000 map, seven 1:20 000 maps and a legend sheet.
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