| 摘要 |
A method of mining utilizing a reciprocating drive, in which a tooth is driven along a relatively straight path over an ore surface in one direction of movement so as to cut a groove therein, and then a wheel is substituted in place of the tooth and is rolled within the groove in the opposite direction, the wheel having a radially wedge-shaped circumferential edge portion which applies laterally outward and downward crumbling forces to the groove walls.
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