floatation process images of sandstones mines

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Sep 19, 2019 Cutouts and rolls. Definition and formation: Cutouts are areas where a coal seam is truncated by noncoal rock (generally sandstone, but not uncommonly fine-grained rock). Rolls are areas where a noncoal rock (generally sandstone) cuts through overlying roof rock to the top of the coal, causing the coal to bend or bow down beneath it, without a ...

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