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Prince Albert Mine Plan of Operations 110(d) Operation Description <br />necessary to accommodate the waste rock being brought out of the mine as the waste pile is <br />constructed back towards the mine portal area. The waste rock will be dumped from the underground <br />haul trucks along the forward edge of the pile as it is advanced back towards the portal location, then <br />spread and wheel -roll compacted with a skidsteer or mid -sized wheel loader. Excavated top soil and <br />stripped vegetation will be stored in the flat area southwest of the mine portal location (see Topsoil <br />Stockpile, Figure 3 "Mine Plan Site Map "). This waste rock placement method will result in waste <br />piles that are in a final configuration for reclamation at all times. The placement of a growth medium <br />cover, seeding, and vegetation growth monitoring will be all that is required to complete final <br />reclamation for the waste piles. This methodology of waste rock placement should result in a <br />minimum of surface disturbance and limit the soil erosion potential in the mine operations area. The <br />two waste piles at their maximum extent during the life of the mine will have the following physical <br />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 />c. Two representative samples of waste rock were collected and the SPLP analytical results <br />demonstrate a leachable fraction that is below the applicable Water Quality Standards listed in <br />Attachment U.8.4 to the attached DRMS Exhibit U "EPP ". Laboratory results for these samples <br />are included as Figures U.10.1 and U.10.2 to the EPP. <br />4.1.5 Ventilation Borehole(s) <br />One 48" to 84" ventilation borehole is currently planned for the Prince Albert Mine, if additional <br />underground ventilation capacity is required. The proposed borehole location is indicated on the <br />Figure 3 "Mine Plan Site Map." This borehole will intersect the underground development headings <br />from the surface and will provide the necessary exhaust ventilation and may be used as an emergency <br />egress point for the safe operation of the mine. The ventilation borehole will be cased for the first 10 <br />feet and sealed at the surface, with additional casing installed and grout sealed during placement if <br />the borehole passes through any aquifers to prevent intermixing of waters between formations. <br />Alternatively, the ventilation borehole may be cased for 4 /5ths, or more, of the total depth if it is used <br />as a secondary escapeway. A work pad area 66 ft x 66 ft will be cleared on the ground surface to <br />accommodate the pilot -hole drill rig, a 20 ft. X 20 ft. concrete pad (if necessary), and the raisebore <br />equipment. This same area will be used for the installation of the ventilation fan and a portable <br />generator (if an electric fan is used) after the borehole is completed. Each borehole pad area will be <br />accessed by a 10 ft wide roadway. Alternatively, each ventilation borehole may be constructed by <br />excavating a conventional raise from the underground workings or constructed from the surface using <br />a surface drill rig and drop -raise excavation technique. <br />Rimrock Exploration and Development Page 12 of 27 <br />