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REVISED <br /> Exhibit D: Mining Plan <br /> Black Mountain Sand Weld LLC(Black Mountain) plans to construct and operate Lost Creek Mine,a 2.4 million ton <br /> per year(Mtpy) industrial proppant sand production facility in Weld County, Colorado. It will consist of an open pit <br /> mining operation,sand wash processing plant and associated loadout facility located on 2,215.59 acres of private <br /> land.This includes approximately 1,796 acres of affected land for mining activities, processing facilities, and the <br /> access road. Lost Creek Mine will be accessed using Weld County Road (WCR) 91, which runs north-south along <br /> the west side of the project area.The onsite facilities, approximately 45 acres,will include a wash processing <br /> plant, fueling station and ready line, office and maintenance/warehouse buildings, and a loadout facility. Utilities, <br /> including gas, water, and electric,will be brought to the area.The permit boundary has been offset at least 200 <br /> feet from the affected lands boundary,the plant facilities, and WCR 91, ensuring a buffer area between the active <br /> project area and neighboring lands.This buffer area will consist of undisturbed land covered in natural vegetation. <br /> The Lost Creek Mine will produce industrial proppant sands over approximately a 35-year period. All mined <br /> material will report to the sand wash processing plant for separation and beneficiation. Product will be stored <br /> in silos for loading and transport.The facility will employ approximately 145 personnel in 3 shifts,which include <br /> approximately 65 hourly and/or salaried personnel at the mine and approximately 80 hourly and/or salaried <br /> personnel for the sand wash processing plant. Operations will be conducted using appropriate Best <br /> Management Practices(BMPs)for storm water control, ground water protection, and fugitive dust mitigation. <br /> Mine Plan Requirements <br /> Included below is the mine plan information, as required in Section 6.4.4 of the Colorado Mined Land <br /> Reclamation Act. <br /> 6.4.4(a) Methods of Mining—Exhibit D1, Mining Plan Map shows the estimated size and location of each mining <br /> block(1-year mining period) within the 15L 10-year period. Mining of one yearly block at a time is planned,with <br /> concurrent reclamation as practicable. It is estimated each highwall will take approximately 3 years to regrade <br /> and reclaim. To develop a pit, topsoil (approximate average 2' depth over the life-of-mine) will be stockpiled <br /> onsite to be used during reclamation or spread directly as practicable.An initial topsoil stockpile will be <br /> developed adjacent to the affected area perimeters in order to minimize disturbance. It will be constructed <br /> with a slope of 5:1 (H:V) and seeded for erosion control.The proposed seed mix is the Weld County Sandy Site <br /> Mix, as shown in Exhibit E. Runoff will be controlled with BMPs.The conceptual location of the topsoil <br /> stockpile(s) in year 5 are shown on Exhibit D1, Mining Plan Map. <br /> After salvaging topsoil, all sand reserves will be excavated and transported to the sand wash processing plant. <br /> During the first several years of the operation, material will be hauled by 40-ton mining trucks to the sand wash <br /> processing plant; in later years the material may be piped to the plant in a slurry in a closed loop system. If a <br /> slurry pipeline is used, a technical amendment of the existing mine permit will be completed prior to beginning <br /> construction on the pipeline. An approximately 250 foot by 200 foot by 20-foot plant feed stockpile containing <br /> material trucked from the mine will be maintained at the sand wash processing plant throughout operations. <br /> The plant feed stockpile will hold approximately 45,000 tons of material and will be constructed so the slopes <br /> match the natural angle of repose for stability.See Figure D3 for location of this plant feed stockpile. Stockpiled <br /> material will be loaded on conveyors to be washed and sorted at the sand wash processing plant. <br /> The sand wash processing plant will separate saleable product from backfill material during processing. Backfill <br /> material (unsuitable for sale based on size requirements) will be stockpiled as needed at the sand wash <br /> processing plant or directly used as pit backfill for site reclamation.The backfill stockpile will not exceed 140- <br />