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MINING PLAN <br />Phase 1 MINING PLAN REQUIREMENTS (CHANGES FROM ORIGINAL PLAN) - <br />Requirement: Phase 1 will remain basically as originally designed with respect to the area of <br />mining and the direction of mining. However, the slurry wall installation a[ the end of Phase 1 <br />has been deleted from this plan. (No discussion associated with this requirement) <br />Requirement: Phase 1 will be backfilled using a series of sediment basins. Wash fines in <br />combination with overburden and soil shall be used [o backfill Phase 1. (See Page 21) <br />Regubement: The actual arrangement of sediment basins may vary at the discretion of the <br />operator so long as all basins have at leas[ one side with an unsealed connection to adjacent <br />unmined land and a significant portion of the groundwater is allowed to Flow completely <br />through the backfilled area. (No discussion associated with this requirement) <br />Phase 2 MINING REQUIREMENTS - <br />STEP 1: Streambank Strengthening and Protection Issues <br />Requrrem ent: Prior to mining Phase 2, Streambank strengthening and stabilization shall be <br />installed along the river bank south of Phase 2 at all locations where it is expected that <br />erosion may occur. The preference will be for the installation of closely spaced (20 fee[ or <br />so) jetties keyed into the bank antl extending a short ways into the river flow. Prior to <br />installation approval from [he U.S. Army Corps of Engineers may be required. <br />(See Page 22) <br />Requirement: As an additional precaution, the southern side of the pit will not be mined <br />within 300 feet of [he river until any Streambank stabilization on the river bank has <br />developed to a point where it can protect the bank from undercutting. For the firs[ two or <br />three years of the operation in Phase 2, mining will stay north of that 300 foot setback. (No <br />discussion associated with this requirement) <br />Requirement: A temporary overflow protection berm will be constructed along the south <br />edge of the affected land. This berm may require FEMA approval prior to construction. <br />(See Page 24) <br />Pueblo East Pit Amendment 3 (2007) Exhibit D Page 4 of 34 <br />