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Exhibit D Mining Plan 6.4.4(d) <br />Revised 1/29/2011 <br />DBMS Ques # 2 <br />(d) The size of the area(s) to be worked at any one time: <br />• The proposed permit area will be 232.0 acres and the affected area is proposed to be <br />approximately the same. The size of the area to be excavated at any time is shown on the Mining <br />Plan Map, Drawing 2, attached. The smallest area (phase) will be approximately 10.0 acres and <br />the largest area will be approximately 12.8 acres. <br />(e) An approximate timetable to describe the mining operation: <br />This is a long term mining operation. The estimated tonnage of minable sand and gravel is <br />811,400 tons. Total excavation (including overburden) is estimated at 2,563,800 tons. It is <br />estimated mining will occur at a very slow average rate of 90,000 to 110,000 tons of total <br />excavation per year. The estimated life of this mining operation is 29 years if the anticipated sale <br />of product is met. <br />(i) An estimate of the periods of time which will be required for the various <br />phases: <br />It will be a phased operation. Prior to Phase One, a slurry wall will be constructed, taking <br />less than 6 months. Each mining phase is expected to take approximately 9.3 years. All <br />phases are dependent on market conditions. <br />• Reclamation, once mining is complete, is expected to take 6 months. The remaining area to <br />be reclaimed will be the product storage area, overburden stockpile, access roads and <br />processing facilities area. These areas may remain disturbed for an indefinite period of time. <br />The City of Lafayette may wish to keep these areas for municipal use, such as equipment <br />storage, continue to draw from the overburden stockpile and product stockpiles for City <br />projects, etc. At that time, the City may approach the DRMS for release of all reclaimed <br />areas and seek the ability to retain the remaining areas for City use. <br />(ii) A description of the size and location of each area to be worked during each <br />phase: <br />Mining will be done in three phases. Phase One will be approximately 12.6 acres and is the <br />northern most Phase. Phase Two, the center phase will be approximately 12.8 acres. Phase <br />Three, on the south side of the mining operation will be approximately 10.0 acres. <br />(iii) Outline the sequence in which each phase of the operation will be carried <br />out: <br />Upon completion of the slurry wall, the Phase one area will be stripped of topsoil and <br />overburden. Phase one will be mined. Once Phase One nears completion, Phase Two will <br />have topsoil and overburden removed, making available the sand and gravel resource. This <br />• process will be repeated for the final phase, Phase Three. Please see item (e)(ii) above.