Mines and mineral resources on postmarks

found: Work cat.: Kutz, K.J. Untold wealth, c1998:pp. 3-4 ("With my lifetime background in the mineral industry, within Canada and around the world, it is indeed a pleasure to be able to present the colorful history of such a fabulous Canadian industry and illustrate it using postal related material to enhance its appeal ... The illustrated material contained herein comes in various forms: covers (envelopes) ... covers from a mining location canceled with the mining town date state")