REV01613 - Laserfiche WebLink

Home Browse Search

FLAG REHOURCEH~ INC. • • I PAeE 2 TECHNICAL REVIHIUN -JULY 1 O, 1 999 reference in this description because it separates the two mining areas. Gravel stockpiling will still take place on this area and it contains the concrete casting beds used to make pre-stress panels and structures. MINING METHODS In the current plan we were allowed to ,have 1,950 feet of vertical working face where front end loaders were used to remove gravel. We now use a dozer to push gravel into the dewatered part of the mine and into stockpiles. It is then removed by loader and fed into the processing plant. This allows us to maintain the 3h to lv slopes as mining progresses. There may be ae much as 200 linear feet of vertical face on the site that will need some sloping be- cause not all areas can be economically mined using a dozer. There was one area on the south side that was un- minable because it had no gravel under the overburden. This area is where the asphalt plant was located so it is off the gravel reserves under the Plant Site area. As we mined east on Stage 2 we found the gravel thine as it approaches the access road so the Concrete Batch Plant was moved on a site next to the road. There is no change in the mining method as it will stay a dry operation and pumping will continue was approved. One change is that we will leave a natural dirt separator between the west mined area and the east mined area. This will allow us to start mining east of the plant site in the near future and allow the west side to fill with water. We plan to do this to reduce our dewatering costs until just before mining ends. The last area to be removed will be the western part of the Plant Site that is acting ae a dike. The west area will be partially pumped before the two mined areas are cut together. Again the 3h to lv slopes will be maintained as this berm is removed. A small pond will be created along the 'river on the north aide of the mine. This area was originally part of Stage 1 but due to the mine development plan used by the previous operator it ie not practical to create one lake without removing a large berm separating the two areas. We will mine this area with a dragline during periods of low water. The slopes in this pond will be mined 3h to lv. This method is not the most coat effective, but it will allow us to remove most of the deepest material from this area without disrupting the flood plain. This area it is above the normal highwater line of the river and more than 100 feet will separate the lake from the river. MINING MAP REVISIONS Review of Map Exhibit C-1 shows how the site may look when mining has progressed into the east area. The western lake area reflects how the site looks now. We have a large topsoil pile along the east aide of the entrance road and on the north side of the west mined area. This soil came from the Plant Site and mined areas and contains approximately 48,000 cy suitable for reclamation.