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Prince Albert Mine 110(d) Permit Application Exhibit U - EPP <br />up to two feet thick will be pushed by bulldozer from the nearby Secondary Waste Pile over the top of the <br />ore storage area. This waste rock material will in turn be covered by growth medium and a vegetative <br />cover established consistent with the remainder of the reclaimed mine site. <br />U (6.b) Mine Waste Rock <br />The sub -ore grade, or waste rock, material excavated from underground and brought to the surface is <br />subject to special handling and reclamation procedures because it is a potential source of toxic materials. <br />U (6.b.1) Mine Waste Rock Stockpile(s) <br />There may be two mine waste -rock stockpiles developed as part of the expanded 110(d) Prince Albert <br />Mine. The existing waste pile located northeast of the mine portal from development work conducted <br />under Prospect NOI P- 2005 -21 will be incorporated into an expansion of that same pile under the 110(d) <br />permit. This waste pile is labeled as the Primary Mine Waste Pile on the Exhibit E, Figure E.1 "Mine <br />Plan Site Map." A second waste pile may also be developed under the expanded 110(d) mine operation <br />depending upon the overall size of the ore resource and the economics associated with accessing that <br />resource from one location. This pile would be located southwest of the mine portal and is labeled as the <br />Secondary Mine Waste Pile on the Exhibit E, Figure E.1 "Mine Plan Site Map." The waste rock piles will <br />be constructed with a 3H to 1V exterior slope starting at the farthest extent of the final waste pile footprint <br />and proceeding back towards the mine portal location as waste is excavated underground and brought to <br />the surface. Initially, a roadway will be cut through the topsoil to the farthest extent of the footprint, and <br />then only enough topsoil and vegetation will be removed in successive stages from a limited area at the <br />leading edge of the waste pile to accommodate the waste rock being brought out of the mine. The waste <br />rock will be dumped from the underground haul trucks along the forward edge of the pile as it is advanced <br />back towards the portal location, then spread and wheel -roll compacted with a skidsteer or mid -sized <br />wheel loader. Excavated top soil and stripped vegetation will be stored in the flat area southwest of the <br />mine portal location (see Topsoil Stockpile, Exhibit E, Figure E.1 "Mine Plan Site Map "). This waste <br />rock placement method will result in waste piles that are in a near -final configuration for reclamation at <br />all times. The placement of a growth medium cover, seeding, and vegetation growth monitoring will be <br />all that is required to complete final reclamation for the waste piles. This methodology of waste rock <br />placement should result in a minimum of surface disturbance and limit the soil erosion potential in the <br />mine operations area. The two waste piles at their maximum extent during the life of the mine will have <br />the following physical and chemical characteristics: <br />a. Primary Waste Pile = 13,369 cubic yards with a footprint of 1.146 acres. <br />b. Secondary Waste Pile = 3,371 cubic yards with a footprint of 0.416 acres. <br />Note: Section U (10) Geochemical Data discusses the geochemical evaluation of the waste rock samples <br />and the SPLP laboratory results for these samples are included as Figures U.10.1 and U.10.2 to the EPP. <br />Rimrock Exploration & Development Page 23 of 39 <br />