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18 Disposal of Tailings and Sludges in Mine Workings <br /> No tailings or sludges will be disposed in underground mine workings as part of this permit <br /> Amendment. However, development rock generated during underground mining activities is used <br /> to backfill stopes and other workings as underground mining progresses. <br /> Previous approvals from DRMS allow development rock to be used for site road maintenance, <br /> backfill or placement in TSFs or to be sold to the County for use off site. <br /> M-2012-032 <br /> Amendment 02 Exhibit U <br /> December 2021 U-34 <br />