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EXHIBIT D - MINING PLAN <br /> The information provided in this Exhibit is intended to satisfy the requirements outlined in Section 6.4.4 of <br /> the Colorado Mined Land Reclamation Board Construction Material Rules and Regulations: <br /> (a) Description of the method(s)of mining to be employed in each stage of the operation as <br /> related to any surface disturbance on affected lands; <br /> The permit area includes a significant deposit of windblown sands located in dunes in Weld <br /> County.The site is located north of the South Platte River and is accessible through private <br /> roads owned by property the owner. It encompasses 640 acres (plus or minus) and consists of <br /> one slurry wall lined pond. Prior to starting construction of any slurry wall, a Technical Revision <br /> to update the site bonding will be applied for and will include the slung wall design report. <br /> Site Preparation: <br /> Initial disturbance on the property will be stripping overburden and flattening the area in the <br /> northeast portion of the Site to establish the processing area footprint.An access road will be <br /> constructed to the plant area. <br /> Mining: <br /> The property boundary/affected land boundary is delineated by a barbed wire fence <br /> surrounding the section. The site will contain one (1)mine cell of approximately 225 acres. <br /> Excavation will start in the northeast corner of the Site to establish a flat area for the plant. <br /> After establishing the plant and access road mining will proceed from east to west. Initially, <br /> topsoil will be removed from the current phase and stockpiled in the stockpile area depicted on <br /> Map C2. Subsequent to initial stripping,the mine cell will be excavated down to bedrock with <br /> 3:1 side slopes utilizing scrapers, loaders, and/or excavators. Haul trucks will move the mined <br /> material to the plant location. <br /> Groundwater was not encountered at the Site during exploratory drilling except in isolated <br /> areas. Since groundwater is not expected to be encountered during mining, mining will be <br /> performed in an unlined cell.There are plans to line the western side of the cell tying into <br /> bedrock at elevation 4,555 feet.The slurry wall will be utilized for water storage and will be <br /> ancillary to the mining operation.The slurry wall will be constructed once the western side of <br /> the site has been mined to 4,555 feet. <br /> The sand deposit is an average of 30-feet in thickness and ranges from 15 feet to 45 feet deep <br /> within the windblown sand deposit.The deposit is overlain by an average of 6 inches of topsoil <br /> and no overburden. The pit is made up of the primary sand layer overlain with topsoil.An <br /> additional alluvium sand layer exists within the windblown sand deposit,found primarily in the <br /> areas approaching bedrock along the south of the site. It reaches an average thickness of 1 <br /> foot in the southernmost mining area of the main pit. The bedrock is an tan to olive-gray <br /> siltstone and some grey sandstone that exists between approximately 15 to 45 feet below the <br /> surface. <br /> All mining will continue to the bottom of the sand deposit with 3H:1 V final mining slopes along <br /> the perimeter.The active highwall will be at a near vertical slope and will progress to the <br /> halfway point of the final mining slope. This allows for the remaining highwall to be knocked <br /> down via dozer to create the completed mining slope. Slopes will then be backfilled with sand <br /> or overburden to the reclaimed 3H:1 V slopes. <br /> 70 Ranch—Section 25 Sand Mine—MLRB 112 Permit Amendment <br /> Exhibit D- 1 <br />