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CML1tB -Exhibit D Mining Plan Page 2 After sufficient forwazd progress has been attained so that equipment can move freely in the pits, all waste material removed from the advancing face in each of the four horizons will be used in sculpting the ground surface to final form in accordance with the approved reclamation plan. Backfilling and/or reshaping of the pits will then continue for the remainder of the project life. Once sculpting has been initiated, the waste material will be levelled into a permanent landform, topsoil replacement will begin, and revegetation will be started. These activities will continue throughout the project life. All field equipment will be diesel powered and no powerlines will need to be constructed into Dowe Flats. Drills will be required to prepare the overburden and limestone for blasting; dozers are needed to assist in levelling drill sites following removal of any topsoil with scrapers. The blasted rock will be lifted by front loaders and deposited into off-road haulers for disposition onto ~ Z land to be reclaimed or for transportation to the plant (limestone). ~ r~^~ Production rock will be hauled to the plant by truck on a private, dedicated haul road. Truc will either be 25 ton or 85 ton dumps, depending on the conditions of approval for the tg way • Access Permit issued by the Colorado Dept. of Transportation (Southdown's preference is the 85 ton trucks in order to reduce the number of crossings of State Highway 66). The haul road location is shown on Map C-2 and will cross four irrigation ditches, and State Highway 66 and the Burlington Northern Railroad track at grade. The road will go over the St. Vrain River, cross land owned by Frontier Materials, Inc., then cross Boulder County Road 49 and enter the cement plant property. Improvements to public roadways will be performed as necessary and as required by the Boulder County Public Works Department and the Colorado Department of Transportation. ~e~Ti--Cai~ed_-s made up of limestone beds 1-2 feet in thickness separated by thin shale or clay partings. This bed has the highest lime content of any of the horizons at Dowe Flats and therefore will be the most important of the horizons mined. In order to obtain sufficient m from this bed to supply plant needs for the 25-yeaz project life, a ma~um 1,100-foot width pit is proposed. Maximum pit depth is estimated to be approximately 125 feel'a3 measured from the original ground surface. e 2nd Ridge consists of r thin limestone seams interbedded with shale. Reserves have been • calculated to a p' epth of 70 feet