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6.4.4 Exhibit D <br />Mining Plan <br />The Phillips Ranch Property Gravel Pit #2 will continue to be mined to a depth <br />ranging between 10 and 15 feet. The target reserve, Cascajo and Kim - Cascajo <br />complex, are present in the top soil terrace and ranges in thickness from three to 15 <br />feet. Overburden ranges in thickness from 1.5 to five feet. The primary commodity <br />is gravel with secondary commodity of dirt. Overburden and fines will be retained on <br />site to be used during reclamation. <br />The life of the proposed operation is speculative due to fragile economic <br />condition of the construction industry. If economic demand remains low and <br />extraction is limited to less than 70,000 tons per year, approximately six acres per <br />year will be mined. At this slow extraction rate, the life of the mine would extend to <br />no less than 20 years. In the event demand for construction aggregate improves, <br />the life of the mine is anticipated to be 12 to 15 years. Determination of the life of <br />the mine is difficult. <br />The mine will develop in 20 acre phases. Each 20 -acre phase will be bonded <br />prior to disturbance. Mining will proceed from the current disturbance north and east <br />to the permit boundary, staying north of the interior cattle fence shown on Exhibit C. <br />Upon completion of the north portion of the permitted area, mining will turn <br />southward. The cattle fence will be relocated into the mined out area, in accordance <br />with the lease agreement. Mining will proceed southward in 20 acre phases toward <br />the San Isabel power line, the southern boundary of the permit area, maintaining no <br />less than a 10 foot setback, in accordance with recorded easement and agreement <br />with San Isabel Power. Mine equipment will be hidden from view by the north facing <br />mine wall. <br />The active mining area is characterized by a perimeter berm of undisturbed <br />native material. This perimeter berm is protective of surface water drainages and <br />creek beds by preventing siltation from disturbed areas. The native vegetation <br />remains undisturbed on the outside of this berm, preventing erosion frequently <br />present on berms constructed of topsoil reverses or mining fines. <br />Earthmoving equipment will vary with mine development. Depending on <br />depth of plant growth material and overburden, bulldozers and /or scrapers will be <br />used to expose target reserve. Loaders will extract the gravel reserve and feed the <br />processing plant. Bulldozers will maintain slopes and manage stockpiles when <br />necessary. Reclamation will require bulldozers and graders to contour slopes and <br />prepare surfaces for seeding. <br />The aggregate processing plant will move with the active mining phase. The <br />processing plant will include portable crushers, screens and conveyors and will <br />operate with the disturbed area. A portable asphalt and /or concrete plant may <br />temporarily operate on site in the processing area if required for a project. The <br />control van will serve as operation center for employees. All interior haul roads will <br />be temporary, reclaimed as mining progresses. <br />4 <br />