Publisher's Synopsis
Excerpt from Mineral Resources of Michigan With Statistical Tables of Production and Value of Mineral Products for 1915 and Prior Years: With a Treatise on Limestone Resources
The production of the Michigan copper mines during the year 1915 was the largest in the history of the industry. According to the figures of the U. S. Geological Survey, the total refined copper produced amounted to pounds, as compared with pounds in 1914 and with pounds in 1912, the record production previous to 1915.
There was mined and milled in the Lake Superior district tons of ore-producing concentrates, containing pounds of copper, or a recovery of slightly above one per cent of copper from the ore. A portion of the concentrates produced was not smelted in 1915.
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