2018-11-19_REVISION - M1976056 (6)

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Exhibit D MINING PLAN Unless specifically discussed below the methods described in the November 1976 and August 2000 Mining and Reclamation Plans and Technical Revisions filed on 12/23/1983 , 3/28/1991, 5/8/2012 , 8/28/2012 and 7/24/2015 will remain unchanged. In 1976 the application was for a 46 . 55 acres ± permit area that would be reclaimed as 2 lakes and the surrounding area would be resoiled and revegetated. Mining was to be done in 4 Stages by a wet dredge starting on the west part of the property in Lake Marjorie near the asphalt plant and the processing site was to be the south end of Lake Marjorie . Mining would then move to Lake Robert and mine from north to south. With the final area to be mined being the south end of Lake Marjorie . In 1983 , a Technical Revision was filed to reconfigure Stage 1 (north side of Lake Marjorie) , add a bridge to cross the Lowline Ditch, revise the seed mix and mulching requirements and recalculate the bond. The Technical Revision filed in 1991 was to remove the staging, move the bridge to the south permit line, revise the Mining Plan and it' s Timetable and Reclamation Plan and it' Timetable and recalculate the bond. The permit was amended in 2000 to add approximately 39 . 80 acres ± that is now the West Area containing 2 lakes, East Lake and West Lake . The total permit area is now 86 . 35 acres ± . Method of mining did not change and mining would start on the north end of West Lake when mining in Lake Robert was done, then move to the East Lake and finish on the south End of Lake Marjo- rie . In 2012 two (2) Technical Revisions were filed, the first was to add a provision for minor blasting at the mine to facili- tate keeping the mining face in a safe configuration. The second added a Weed Control Plan to the permit . The most recent Technical Revision was required as a result of the September 2013 South Platte River flood event . It in- volved revisiting the permit for the Lake Robert area where the river had entered the mine and backfilled nearly 5 . 0 acres of the south end, destroyed most of the reclamation that was completed on the lake shore and left a flood overflow channel bisecting Lake Robert . It was anticipated flood water would continue to flow thru the channel and enter the Lake Robert area whenever the Platte River flooded. An armored outlet structure was installed in the north lake shore and the south shore was left open. The fill area was left to be naturally revegetated since it was sand washed in by the river and there is no topsoil for that area . The current plan for the Lake Robert area is to grade the above water slopes to 3 : 1 . The below water slope were washed to flatter then 3 : 1 by the flood, prior to the flood reclamation was pretty well done in the Lake Robert area . A graveled equipment parking area was added and a concrete pad left from the dredging operations was retained in this Technical Revision since these will be used for equipment parking in the future . The current bond is $131, 200 and a new reclamation cost estimate is presented in Exhibit L on page 45 of this applica- tion. Existing sloping, grading and shaping plans will apply to 6