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EXHIBIT D MINING PLAN <br /> 1. General Mining Plan <br /> The property boundary has been surveyed on site and the permit area will be surveyed prior to <br /> any site disturbance. Map C-2 shows the mining plan. <br /> The gravel zone is estimated to be 40-70 feet thick in an alluvial deposit and is overlain by 1-3 <br /> feet of topsoil and overburden at its deepest areas. The mineable Quaternary-late Pleistocene <br /> Uncompahgre alluvial deposit overlies the Mancos Shale with a contact depth of between 40-70 <br /> feet below the surface. Because the contact surface of the overlying gravel to the Mancos Shale <br /> is unconformable, exact locations of the boundary are difficult to determine prior to mining and <br /> without analysis of drill logs. Very limited outcrops of the Mancos Shale may be observable at <br /> the northern drainage cut that exits the northeast corner of the site. Therefore, while mining is <br /> planned to a total depth of 700 feet, the operator will not mine into any shale encountered. In the <br /> event that mining, prior to 70 feet of depth, reaches a shale zone, the pit will be backfilled to two <br /> feet above the shale zone and this elevation will become the new maximum pit depth. <br /> In general, the new area will be mined by first excavating soil/overburden with front end loaders <br /> which will be stockpiled and used to backfill the slopes of mined out areas to a 3H:1 V slope <br /> during Reclamation as shown on Map F-1. The raw gravel material will then be loaded into a <br /> crusher/screen plant where various sizes of product will be made and placed in separate <br /> stockpiles. Dozers may also be used to move topsoil/overburden or gravel. <br /> The direction of mining will be from the north to the south. Mining activities are expected to <br /> occur approximately 4 to 6 months per year, while the processing operations including <br /> screening/crushing and washing can occur any time of the year. Mining will proceed from Area 1 <br /> to 10 as shown on Map C-2. The mining of the deposit will occur to the limits shown on Map C- <br /> 2 and will be mined to a slope no steeper than 2H:1 V in order to maximize gravel recovery. <br /> Backfilling with overburden will create shallower reclaimed slopes. <br /> Rock Pile LLC mines using a 1 H:1 V to near vertical slope on active mining faces. Highwall <br /> mining will progress to an offset line from the crest line, which marks the mid-slope of the <br /> 2H:1 V mining slope. Both boundaries will be staked prior to mining in the area. This offset <br /> Base Products Gravel Pit#1 X •,.,. , �_I _1_1- II <br /> February 2018 D-1 <br />