Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 445
does. It consistsin digging a hole under a mine, running a carunder, and letting the mine fall into the car.That is literally what it amounts to. Fig. 5 shows what seems to be a yawningchasm, with four or five conical holes in the pit. These holes, or chutes, converge to a commoncenter, or chamber,… … FIG 6. OKE-DOCKS AT DULUTH, MINNESOTA. i9o4.] THE STORY OF A BAR OF IRON. 433 the Messaba mines. Much of it comes as fineas coarse gravel, not at all like the usual hard,stony ore lumps. Even the larger pieces breakand crumble readily,which greatly aids thework of the steamshovel and especiallythe…
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