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Gold assaying is essential in determining the amount of gold in a mineral deposit. The process involves bringing a rock sample, most often a core obtained through drilling, to a laboratory where it is examined by experts. Assay results are often mapped and used to pinpoint targets for future drill programs.
1 The stone(s) you want to drill a hole in. 2  Dremel, Foredom or similar rotary tool, preferably with a flex-shaft attachment (can be done without the flex-shaft, but will be much easier with). Diamond engraving burrs (or coring bits, but they make holes much larger than I wanted, and also I would have had to special order them). 2  Container deep enough for the stone being drilled, but not so deep you can't comfortably hold the stone in place.