2019-05-24_PERMIT FILE - M2019027 (2)

Home Browse Search

D-4 Plant Site Area: Seedbed preparation will consist of an over-grading of the plant area portion of the site to re- establish natural ground contours and drainage pathways to as close as those present prior to mining(with the exception of remnant pit depressions). This may be followed by a discing of the surface, if determined necessary, to minimize or mitigate any compaction affects and to ensure that residual plant root systems and organic materials are retained within the uppermost 12-inches. These areas will then be considered ready for seeding. Fines Recovery Pit: The fines recovery pit,at closure,will have been filled to approximately 87%of maximum volumetric capacity. This suggests a"worst-case" situation of an approximately 2-feet deep depression across the 275-ft. by 235-ft. feature present at closure. However, in the event incremental processing takes place due to exercising the option to mine within the west extension of the main mine pit(or via the processing of offsite- sourced material),this"depression"will be virtually eliminated(Note:Exhibit E-2:Reclamation Map depicts the fines recovery pit, at cessation of operations, as being filled to the approximate original contour, on the assumed basis that some measure of incremental mining will take place). It is envisioned that significant infiltration and evaporation will have greatly increased the solids/liquids ratio, and hence the surface stability of the contained reject material over the duration of the late-summer operations. Accordingly,CSC will directly place the growth medium material atop the entirety of the fines recovery pit feature via low ground pressure, tracked vehicle (dozer) push. A nominal 8- to 12-inch course of"growth medium" will be spread across the entirety of the fines recovery pit feature,with the so-placed"growth medium"serving as the seedbed material. Again, based on the projected fill volumes either placed during operations or the subsequent site reclamation activities,it is anticipated that the fines recovery pit footprint area will be re-established to at or near pre-mining topography, as shown on Exhibit E-2: Reclamation Plan. Main Mine Pit: CSC will utilize a dozer and/or excavator for crest and further overall slope reduction within the main mine pit, after which a nominal 8- to 12-inch course of"growth medium"will be placed on the side- slopes (at a 3H:1 V slope gradient or less) and base of the main pit feature. As with the fines recovery pit, the so-placed"growth medium"will serve as the seedbed material. Keenesburg Project—Limited Impact 110 Application_May 24,2019