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6.4.4 Exhibit D - Mining Plan <br />MINING METHODS <br />All of the mining operation will be "dry" mined. Dewatering trenches will be dug <br />around the perimeter of each mining cell and dewatered to Boulder Creek. <br />Stripping and mining will incorporate conventional aggregate mining methods, <br />including use of scrapers and dozers to strip overburden, backhoes and scrapers <br />to mine sand and gravel, and haul trucks to move material onsite. This operation <br />will mine and reclaim concurrently wherever and whenever possible. The permit <br />area has been divided into mining cells. The order of mining will generally follow <br />the numeric cell sequence. <br />EARTHMOVING <br />Cell 1 <br />Mining is complete in this cell. <br />Cell 2A <br />Overburden stripping has begun in the northern area of Cell 2A and operations <br />have and will stockpile approximately 100,000 yd3 south of the excavation. <br />Mining has started and will proceed by mining the backfill areas prior to mining <br />the pond areas. (See Exhibit F -Reclamation Plan Map.) This mining sequence <br />allows for concurrent reclamation and a single movement of overburden <br />wherever possible. Mining will generally proceed from north to south. See <br />Exhibit C-2 Mine Plan, Sheet 2. <br />Cell 2B <br />Overburden from Cell 2B will be stripped and directly replaced in backfill areas of <br />Cell 2A. Mining will generally proceed from north to south. See Exhibit C-2 Mine <br />Plan, Sheet 2. <br />Cell 2C <br />Overburden from Cell 2C will be stripped from the western portion of the Cell <br />(long narrow strip of land) and directly replaced in the backfill areas of Cell 2A. <br />The overburden from the eastern portion of Cell 2C will then be stripped and <br />placed directly into the western portion (long narrow strip of land) backfill area. <br />Mining will generally proceed from north to south. See Exhibit C-2 Mine Plan, <br />Sheet 2. <br />Cell 3 <br />Prior to mining west of Boulder Creek, a low water crossing will be constructed to <br />allow haul trucks to access Cells 3, 5 and 6. The design for the low-water <br />crossing, utilizing large culverts, was approved by both the USACOE and the <br />CDRMS in 2004 as part of the original approval for this permit. A report titled,