mill run

  1. ☆ a quantity of ore whose quality or mineral content is tested by milling
  2. the mineral obtained by such testing

adjective

☆ just as it comes out of the mill; ordinary; average; run-of-the-mill

See mill run in American Heritage Dictionary 4

adjective
Being in the state in which a product leaves a mill; unsorted and uninspected: mill-run fabric.
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