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Return of Coal Processine Waste to Underground Workings <br />No coal processing waste will be returned to underground mine workings a[ EC, except that rock generated during <br />development work can be placed in rock rooms underground. This material does no[ leave the mine and sees no <br />processing. The use of rock rooms has been discussed previously. <br />Permit Revision 04-34 2.05-22 Revised 7/2/04 <br />