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Recipient <br />Page 2 of 2 <br />Date <br /> <br />outlined on Map M12 suggests the existence of cast spoil to the west that <br />could be utilized to mitigate the -175 foot difference by reducing the western <br />post-mining elevations from +75’ above pre-mining elevation to something <br />lower. <br />o A similar although not as dramatic a difference occurs along N402000 <br />between E14335000 and E1444000, or approximately mid-pit, where less <br />drastic elevation differences from pre-mining topography exist. <br />o Reconstructed drainages as depicted in the PR9 post-mining topography lost <br />considerable dendritic stream morphology when compared with the TR115 <br />post-mining topography map, ending up with straight channels, steepened <br />banks and steep slopes just below their origins. It also appears also that the <br />location of some of the drainages changed, such as where a drainage <br />previously existed is now being proposed as a fill and where a rise <br />previously existed is now being proposed as a drainage channel, particularly <br />along the 404000 and 402000 Northings. <br />27. Please present for DRMS review and further discussion a reworked Map M12 <br />sheet 3 between N406000 E1438000 and N402000 E1441050 that includes cross - <br />section drawings along the 406000, 404000 and 402000 Northings with respect to <br />the 1444000 and 1434000 Eastings that reflect post-mining topographies that more <br />closely approximate original elevations and original dendritic stream morphology . <br />Please understand that these updates to the post -mining topography presently <br />proposed in PR9 may result in further review of the Division’s PR9 reclamation cost <br />estimate. <br />