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silica sand crushing screening

Jan 01, 2020018332If the crushed or ground material is retained on an 8mesh screen, the crushing or grinding operations shall be classified as 1710, Stone Crushing. Silica grinding that is performed in connection with sand, gravel or clay digging shall be classified as 40001, Sand or Gravel Digging, if 25 or less of the excavated material is crushed or ground.

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