Bastard

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  1. Said of an inferior or impure rock or mineral, or of an ore deposit that contains a high proportion of noncommercial material. AGI
  2. Said of any metal or ore that gives misleading assays or values. AGI
  3. Said of a vein or other deposit close to and more or less parallel to a main vein or deposit, but thinner, less extensive, or of a lower grade. AGI

Source: Dictionary of Mining, Mineral, and Related Terms


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