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EXHIBIT D -MINING PhAN <br />The information in the original permit application and this section are intended to satisfy the <br />requirements-outlined in Section 6.4.4 of the Colorado Department of Minerals and Geology <br />Construction Material Rules and Regulations. <br />A. Background <br />The original permit application for gravel mining The Shores site was submitted and <br />approved in 1998. The purpose of this amendment application is to obtain authorization <br />to modify the mining operation. The proposed changes to the Mining Plan are described <br />in this Exhibit. Hall-Irwin will mine approximately 221 acres of a 309-acre parcel <br />located in Firestone, Colorado. See attached revised Mining Plan map for specific <br />location to be mined. <br />B. Operational Methods <br />Hall-Irwin Corporation will continue to use the mining process and earthmoving methods <br />described in the original pennit application for The Shores. The only changes to the <br />Mining Plan are as follows: <br />1. Change Mining Sequence and Phasing: The original permit application describes <br />the mining sequence from south to north and then east to west. This application <br />proposes changing the mining sequence by mining south to north and then west to <br />east. After Hall-Irwin has completed mining in the pod adjacent to the processing <br />area, they will proceed north to phase 6, then mining pods to the east. Refer to the <br />Mining Map in Exhibit C for details. <br />2. Mined Area: The total mined area will increase to +221 acres of the 309-acre parcel. <br />Assuming current market conditions, mining the additional material will not extend <br />the life of the mine. <br />3. Earthmoving: Sand and gravel will be excavated and transported to the processing <br />area by haul trucks and/or conveyors. <br />4. Annual Productiou: The annual production rate will be increased. The production <br />rate will range from 400,000 to 800,000 tons per year. <br />5. Equipment: The following changes will be made to the equipment on-site. All other <br />equipment remains the same. <br />a. Scraper - 2 <br />b. Dozers - 2 <br />c. Mechanic Trucks - 3 <br />d. Water Truck - I <br />5. Wash Pond: Hall-Irwin is allowing the original wash pond to fill with silt and <br />become a wetland area. The operator has created new wash ponds immediately north <br />HALL-IRWIN CORPORATION -THE SHORES AMENDMENT 1 (#M-1998-013) Page 12 of 29 <br />