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  1. A rich body of ore or a rich part of a deposit; a mine is in bonanza when it is operating profitably. Also, discontinuous locally rich ore deposits, esp. epithermal ones. Etymol: Sp., prosperity, success. AGI
  2. In miners' phrase, good luck, or a body of rich ore.
  3. Part of a precious mineral deposit that is esp. rich. Bateman, 2

Source: Dictionary of Mining, Mineral, and Related Terms

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