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EXHIBIT D — Mining Plan <br />(a) Description of the method(s) of mining to be employed in each stage of the <br />operation as related to any surface disturbance on affected lands; <br />The mine area, as shown on the attached maps, totals approximately 62 acres. <br />Current site use is for pasture/stock grazing. All disturbed areas will be reclaimed to <br />developed water resource (2 pond areas) for evaporation only. All site mining, <br />processing and temporary stockpiling will be within the excavation footprints of the <br />planned ponds. Each pond water surface will be required to have a gravel pit well <br />permit and any excavation/pond edges will be a minimum of 100 feet from the <br />Yampa River, Deep Cut Ditch and residential water supply well as per the Colorado <br />Division of Water Resources District Engineer. <br />Mining/process activities may take place in any of the 2 pond footprint areas at <br />anytime in order to establish the initial 2 separate water surfaces as soon as possible <br />for stormwater control and to be able to dewater from one pond area to the other to <br />assist in the mining operations. Stormwater/sediment pond/trenches will initially be <br />dug in each pond footprint (on approximate northern ends of ponds). They can either <br />be expanded into the mining/operations area as aggregate is removed and the pond <br />water surface develops or be kept separated from the main excavation pit areas to be <br />used as sedimentation ponds for that specific pond. Once established, each pond can <br />also be used to receive pumped water from the other, as operations dictate, to assist in <br />mine pit dewatering activities. <br />Concurrent reclamation is planned for all the pond edges as each excavation/pond <br />footprint area is developed over time. The total planned final exposed water surface <br />area for both ponds is 359 acres (Pond #1-19.80 ac. and Pond #2 —16.10 ac). <br />Excavation depths may range from 0 to +25 feet below ground level (BGL). Ground <br />water levels are seasonal with a possible upper limit of 1.5 to 3 feet (April —June) and <br />a lower limit of >6 feet BGL. The aggregate mining operations will intercept <br />groundwater at an average depth of 4 to 6 feet BGL depending on the ground level <br />elevation (the site is relatively flat) and the seasonal water table fluctuations. <br />Estimated water surface elevation will average 6194 feet AMSL. <br />Topsoil averages 0 to 8 inches in thickness across the pasture. Topsoil will be <br />removed and temporally stockpiled around the pond footprint limits for use in the <br />planned concurrent pond edge reclamation activities and for any 3:1 bank slope <br />stabilization to 10 feet below the average water surface elevation. Topsoil would <br />only be stripped as and when necessary to expand both the excavation and/or <br />operations areas within pond footprints. Depending on the average topsoil <br />thickness across the site there may be some surplus topsoil since most site <br />WestWater Engineering <br />APPENDIX C - 3 July 2012 <br />