Ballast

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  1. Broken stone, gravel, water, or other heavy material used to provide weight in a ship or other machine and therefore improve its stability or control its draft. Jettisoned ballast may be found in samples of marine sediments. AGI
  2. Gravel, broken stone, expanded slag, or similar material used as a foundation for roads, esp. that laid in the roadbed of a railroad to provide a firm bed for the ties, distribute the load, and hold the track in line, as well as to facilitate drainage. AGI

Source: Dictionary of Mining, Mineral, and Related Terms


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