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MR21-319 2.05 – 45.34 07/27/21 <br /> <br />Borehole completion will involve drilling, installing, and grouting steel surface casing in place to a maximum depth <br />of approximately 60 feet (dependent on the ground conditions encountered) The borehole will be drilled to a depth of <br />1553 feet into the 7 East entries. The borehole will be 12 inches in diameter and house an 8 5/8 diameter casing. Water, <br />drilling fluids, and cuttings will be contained within one or more excavated pits located on the pad site. <br /> <br />Due to the large volume of cement needed to fill the entries and to be able to pump the cement continuously a cement <br />batch plant will be set up on the 6MN pad site. The cement grout will be trucked by cement trucks from the 6MN pad <br />to the 7 East cross entries pad site and hooked up to mobile diesel pumps that will pump the grout underground into the <br />cross entries void. <br /> <br />The pad location is relatively flat and therefore minimal diversion water is expected. Diversion ditches will be placed on <br />the upslope sides of the pad to control any runoff water. The ditches will then be filtered with rock check dams at the <br />ends and vegetation throughout the ditch. <br /> <br />A small access road will be constructed from the 6MN road to the pad. The road is approximately 140 feet long and 30 <br />feet wide to allow for adequate room for truck traffic. The road will be built with adequate pit run for the base and road <br />base for the surface. <br /> <br /> <br /> <br />18LT Dewatering Borehole and Pipeline (MR21-319) <br /> <br />TC plans to drill an additional dewatering borehole in 2021 in the Western Mining District (WMD). This borehole will <br />be located over the 18 Left gateroad, in 3 entry. This borehole will be used to pump water from the WMD reservoir o <br />help dewater the area and keep the water from entering the active mining area. From 18LT dewatering borehole the water <br />can be pumped to the Fish Creek dewatering location and be dumped into that reservoir or pumped to the pit pond near <br />the wash plant for process water. To power the pump a powerline and a MCC Conex building will be placed on site. The <br />proposed location will be accessed from the 16LT borehole access road with the addition of approximately 2,100 feet of <br />new access road. The new access road will be an existing ranch road that will be improved to allow for drill rig access. <br />The road disturbance corridor will be 40 feet with an actual disturbance of around 24 feet wide. The total new road <br />disturbance will be approximately 1.9 acres. And the pad disturbance will be around 1 acre. A cultural study was <br />completed, and any historic sites noted will be avoided during construction. <br /> <br />Topsoil will be salvaged from all new disturbance and stock piled and seeded. Approximately 3600 cubic yards of topsoil <br />will be salvaged from the road and pad area. The pad area is constructed at the base of a gentle hill. Diversion ditches <br />will be place on the upslope side of the pad to divert water from entering the pad site and to avoid mixing of stormwater <br />with process water should there be any during the drilling. All stormwater will filter through a rock check dam before <br />leaving the disturbance area. <br /> <br />The pad and the road will be surfaced with 86 inches of pit run and 3 inches or road base to allow suitable access during <br />the wet and muddy times of the year. The gravel will also act as dust control for the site and minimize erosion of the pad. <br />The topsoil and out slopes of the pad will be seeded with the appropriate permitted seed mix. <br /> <br />Approximately 1,710 feet of new pipeline and overhead powerline will be installed from the 18LT dewatering borehole <br />and tied into the dewatering line and powerline running from the 18LT fan pad to the 16LT dewatering site. The pipeline <br />will be 12-inch HDPE pipe. <br /> <br />The borehole will consist of drilling 1,645 feet and installing and grouting an 18-inch diameter surface casing to a depth <br />of 60 feet, the remainder of the well will be cased with 12-inch steel casing. A drilling mud pit will be constructed on sit <br />to contain the cutting and drilling fluids from the borehole. <br /> <br />Reclamation of the 18LT borehole will consist of plugging and sealing the borehole, re-grading the pad site, replacing <br />the topsoil, and seeding the disturbance with the appropriate permitted seed mix.