Block hole

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  1. A small hole drilled into a rock or boulder into which an anchor bolt or a small charge or explosive may be placed. Long
  2. Used by drillers, miners, and quarry workers for a method of breaking undesirably large blocks of stone or boulders by the discharge of an explosive loaded into shallow holes drilled into the blocks or boulders. Long
  3. A relief hole designed to remove part of the burden from a subsequent shot; used in coal mining.

Source: Dictionary of Mining, Mineral, and Related Terms

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