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IvIINING PLAN <br />E,YHIBIT D (Continued) <br />• 20 foot barrier pillaz will be maintained below the "upper level" (see Map Exhibit D-1A) <br />or the surface were wh~e;eGapplicable. <br />Two additional portals aze planned and aze shown on Map Exhibit D-1. Each of <br />the two subsequent portals will be put in as the then current portal is about to be <br />abandoned; the portals will be put into the footwall ofthe surface mining operation. Each <br />portal will disturb no more than 4 acres +/-, spoil areas included. Within one year after <br />any post-law portal is abandoned, reclamation of that area will begin. Therefore no more <br />than 2 portals will be active at one time. These additional portals will be identified in the <br />annual reports. The mining methods in these new portals will not be changed. <br />Surface Mining (Map Exhibit D-1, D-1B and Figure 1) <br />Clays mined using open mining methods will be mined in two stages. The current <br />workings aze located in Stage 1. Mining will continue both north and south from the <br />current workings to within approximately 50 feet of the permit boundary. Mining in <br />• Stage 2 met ry~y begin uric nrinr r~ ~~.n~tA+;r,n of al] of the surface mining in Stage <br />1 ]s-eer~le4e. <br />The current surface mining operation has been under a I10 Permit (see Map <br />Exhibit C for area affected under the 110 Permit). The clay removed from this area has <br />left a footwall approximately 75 feet in -•~ v,~y~height. Mining will continue <br />downward along this footwall, leaving no more than 150 feet of footwall exposed. Any <br />overburden (see Figure ]) or topsoil encountered during this period will be stockpiled to <br />the east of the current workings. The clay will be stockpiled on the mining floor and <br />removed by truck as needed. A ramp will be constructed to the pit floor to provide <br />equipment access and to be used by the. trucks for removing the clay. <br />After full depth is reached at the cun•ent mining location, the topsoil from the next <br />area to be mined will continue to be stockpiled along the east edge of the area shown as <br />major disturbance on Exhibit D-1. The overburden from where the topsoil was removed <br />will then be used to partially backfill the azea where the full <br />• <br />(Revised May 22, 2000) <br />9 <br />