. Lands, fisheries and game, minerals . CONSERVATION OF MINERAL RESOURCES 409 The known resources cannot be estimated with any degree of exact-ness. Only in the case of placers is a rough estimate possible. The knownresources of placer gold in the Ivlondike alone have been estimated at$100,000,000. Waste.—There is comparatively little avoidable waste in the mining ofgold ores. The operators and smelters recover as much of the gold as iseconomically possible. Every mining engineer engaged in gold miningis continually striving to improve his process. In placer mining the loss of precious metal,
. Lands, fisheries and game, minerals . CONSERVATION OF MINERAL RESOURCES 409 The known resources cannot be estimated with any degree of exact-ness. Only in the case of placers is a rough estimate possible. The knownresources of placer gold in the Ivlondike alone have been estimated at$100,000,000. Waste.—There is comparatively little avoidable waste in the mining ofgold ores. The operators and smelters recover as much of the gold as iseconomically possible. Every mining engineer engaged in gold miningis continually striving to improve his process. In placer mining the loss of precious metal, while considerable, isunavoidable. The best available methods are generally employed. Thetailings, however, are generally dumped into the streams or rivers andoften cover up much low-grade gravel. This practice should be pro-hibited by legislation. Production of Canada.—The silver production of Canada ^ became of importance on the discovery, in 1904, of the rich silver deposits of Cobalt, Ontario, and increased rapidly, the product
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