Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 445
he Vermillion range,where the ores are a little harder,some of the more usual methodsof mining are employed; yet eventhere the deposits are very large,and the work is done with won-derful rapidity. But of these operations of so-called mining, that of gravitymining is the most startlinglystriking… … MINING BY GRAVITY. THE WHOLE MASS IS ORE. CARS ARE LED BY TUNNELS TO THE BOTTOMOF THESE DEEP PITS AND ARE FILLED THERE. That is what gravity mining 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.…
Children's literature
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