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washery

noun plural -ries
  1. a plant at a mine where water or other liquid is used to remove dirt from a mineral, esp coal
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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Historical Examples of washery