2018-11-19_REVISION - M1976056 (6)

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Exhibit D MINING PLAN (cont) direction of mining in each stage is shown as a series of arrows on the Map Exhibit C-1 Mining Plan Map. The slopes will be created as mining progresses around the lake perimeter. Excess sand is used to rebuild the slopes with the dredge each time mining on the site ends . This will reduce the amount of backfilling work needed at any-one-time . Please see Map Exhibit C-1 for how an area may look as mining progresses through it . As explained in 2000 , mining will still continue simultaneously in the existing lake areas depending on the type of material needed by the company. As in the approved plan there will be no more than 1200 feet of above water slope needing backfilling at any time . The working face is at its maximum width when mining is taking place in East Lake where it will be 625 feet long. We have found that as the area is dredged the sand tends to slough off the working face leaving a stabile slope of 2h to lv which needs little work when mining ends . However, some blasting has been used if natural sloughing does not occur. The dredge is used to place sand along the below water bank areas as mining stops each year to further stabilize them and the above water slopes are then graded using a blade to prepare the seedbed. AMENDMENT 2 - Mining sequence change In the current plan McAtee was to mine in West Lake first and the move to East Lake and finish in Lake Marjorie . At this time the cut between the lakes is being completed and mining will start on the north end of the East lake and work to the dredge setback line along the Concrete Plant/stockpile area . Mining will then return to the West Lake area and complete the band of material left on the north and south sides . Mining will end in Lake Marjorie once the West Area is mined out . AMENDMENT 3 - Addition of Industrial areas The Asphalt Plant and Concrete Plans and material stockpile areas that exist at this time and are added because the Mined Land Reclamation Board determined they should be in the permit area . These areas will remain after mining ends since they have the proper zoning in the City of Sterling. The support facili- ties, such as the scale and scale house, plant offices, the concrete pads used for truck parking and raw material stockpiles will remain after reclamation is complete . AMENDMENT 4 - Revised Mining Timetable ACRES PHASE YEARS MINED MINING SLOPE 0 AREA— Lake Robert 3-5 17 . 27 8 . 28 8 . 99 Lake Marjorie 3-5 15 . 49 6 . 65 8 . 84 West Lake 7-10 19 . 80 9 . 12 10 . 68 East Lake 10-12 24 . 29 13 . 23 11 . 06 9