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placed in the WRA. Waste produced during subsequent development and production will be <br />disposed of at the WRA <br />Roof support will consist of metal roof mats anchored into the roof using 5- to 8-foot-long <br />mechanical split-set roof bolts. Bolting will be performed as necessary with the spacing varying <br />according to roof conditions and the size of the opening. The size of the mine openings will <br />depend on roof conditions, but will typically be no greater than 14-feet wide based on the <br />experience of similar mining operations conducted in the same formation. Ten-foot-long mats <br />will be installed diagonally on the ribs when additional rib support is required. <br />The underground area will also include maintenance and storage areas. Routine maintenance and <br />minor repairs will generally be done underground with more extensive repairs and maintenance <br />completed in the surface shop. Roof support materials, blasting supplies, lubricants, and the <br />smaller and more commonly used equipment parts will be stored in designated locations <br />underground. These locations are expected to change as the mine workings are advanced. <br />Groundwater seepage is expected to be minimal. Underground sumps will be constructed if <br />groundwater is encountered. Any water pumped from these sumps will be contained in [he mine. <br />The Topaz Mine is a zero discharge facility with regard to conveyance and discharge of mine <br />water at the ground surface. <br />D.4.5 Exploration <br />Exploration drilling will take place concurrent with mine operation It is anticipated that <br />approximately 50 surface holes will be drilled annually. It is anticipated that 2 to 3 acres of <br />surface disturbance will occur annually in association with the exploratory drill holes. These <br />areas will be immediately reclaimed following drilling. All exploration will be conducted under a <br />state-wide prospecting bond compliant with the Colorado Mined Land Reclamation Act. As <br />noted above, Denison submitted astate-wide prospecting bond to DRMS and the BLM on April <br />25,2007. <br />D.5 Infrastructure <br />This section discusses the infrastructure required at [he mine to support existing and proposed <br />mining activities. <br />5-234007 Exhibit D Mining Plan D-13 <br />