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  1. In quarrying, an unconfined charge of explosive used to bring down dangerous ground that cannot be made safe by barring and that is too inaccessible to bore. South Australia
  2. A protrusion, more or less circular in plan, extending downward into a coal seam. It represents the filling of a streambed pothole worn into the upper surface of the coal-forming material. AGI
  3. Copper as a smelter product before it is refined. Hoffman
  4. A defect in metal, on or near the surface, resulting from the expansion of gas in a subsurface zone. Very small blisters are called pinheads or pepper blisters. ASM, 1

Source: Dictionary of Mining, Mineral, and Related Terms

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