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. a. 5~ EXHIBIT D MINING PLAN Mobile Pre-Mix Concrete, Inc., a subsidiazy of Lafarge Corp. (herein Lafazge) proposes to mine the property situated north of Weld County Road 6, south of Weld County Road 8 and immediately west of State Highway 85. Lafarge supplies local, county, and state governments, as well private industry with aggregate. The site is bisected by the South Platte River. This mining operation will not disturb the South Platte River. The proposed permit area is 237 acres, of which 120 acres will be disturbed by mining. The remainder of the property will consist of setbacks and road right-of--ways. The site has been drilled and testing has verified that there are commercially marketable sand and gravel deposits on the property. The deposit has 3-4 foot average depth of overburden and a 28-30 foot average depth of sand and gravel. Lafarge will mine to the claystone bedrock. The mining face will be in the vertical to '/z : 1 slope range. Phasi°e The Riverbend Operation will process approximately 800,000 tons of aggregate per year, and mine between 10-15 acres a year. At this rate of mining they expect to mine and reclaim the site in approximately 10 yeazs. The rate of mining and overall life of the mine is dependent upon demand. Generally, we believe the mine will progress according to the following time table: ~ Mining Phase Duration of Time(yrs) ~ 2 Cell 4 10 Mining in phases will limit the area of disturbance at any one time (see Exhibit C). The phases depicted in Exhibit C are used io indicate the direction of mining. These phases are neither representative of the maximum area of disturbance nor do they limit disturbance to a particular phase. Mining will commence by stripping Mining Cell 5 and the settling basin area (Mining Cell 1). Cell 1 will then be excavated and the settling basin created. The settling basin will be used to recycle wash water and remove fines. D- I