PREFACE

The study of Nechako River map-area was begun in 1949 as part of the
systematic program to map Canada geologically. The Aluminum Company of
Canada constructed Kenney Dam on Nechako River as part of a development
to supply power to their plant at at Kitimat, British Columbia, and as a result,
areas in this drainage system are flooded below 2,800 feet elevation. But these
areas were mapped before the dam was completed.

This] part of tl the Interior Plateau of British Columbia is underlain by
Pérmian to late “Tertiary sedimentary and volcanic rocks and by Jurassic to
Cretacéous granitic rocks. A thick mantle of glacial drift obscures the bedrock
and this may possibly be a major reason for failure to find important mineral
deposits. In this report, the several rock-units are described, the geological
history is outlined, and the economic geology is discussed.

J. M. HARRISON,
Director, Geological Survey of Canada
OTTAWA, December 22, 1960