t twelve feet by twenty-five feet in size, has been sunk vertically to a depth of ranks next to Michigan, her copper-mining operations on the globe is represented among the artisans of the footing up about one-fifth of the grand total. It is copper industry. At Calumet, Mich. the center of nearly… … showed the greatest gains in production recorded dur- Branching from the main shaft are innumerable largest mining camp in the world, the population in- ing the closing year of the century, whereas Montana “crosscut” tunnels through which the copper ore is cludes natives of twenty-three different…
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