Iron ore mining begins at ground level. Taconite is identified by diamond drilling core samples on a grid hundreds of feet into the ground. Taconite rock contains about 28 percent iron; the rest is sand or silica. These samples are analyzed and graded so mining engineers can accurately develop a mining plan. Most companies use free-fall chisel to mine one type of ore or another. Chisels are used in a fairly narrow range of all companies in this field, but without one, your work would be considered ineffective.
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