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MINING PLAN <br />1. Definition of Extents of Mining Death <br />D <br />The gravel zone varies between 36 and over 60 feet in thickness in an alluvial deposit and is <br />overlain by approximately 2.5 feet of overburden and 6 inches of topsoil. As seen on Map C-2 by <br />the mining depths, the lesser thicknesses of gravel are encountered on the southern end of the permit <br />area, while the greater depth of gravel is encountered to the north. The entire deposit is underlain by <br />a layer of impermeable shale. The depth of mining in the entire permit area is based on the shale <br />contact as well as the level of water from irrigation which is currently being monitored as per the <br />2003 Division of Minerals and Geology ruling which granted the original permit, as discussed in the <br />introduction. The area of concern of encountering water is the northern portion of the current permit <br />area. All monitoring data to date has been compiled and can be seen in the Water Information <br />Exhibit. In the area of concern, all mining depths are based on the available monitoring data and <br />will be three feet higher than the highest level of water measured. In all other areas of the mine the <br />gravel will be excavated to a depth five feet above the shale, with the exception of the northeastern <br />portion of the permit area which will be mined in order to connect with Western Gravel, Inc.'s old <br />Metcalf Pit. No water is expected to be encountered by mining to these depths; however if water is <br />encountered, the area will be backfilled to a level two feet above the where the water was <br />encountered. <br />The current permit area, with the exception of the area being mined, is being irrigated by a local <br />farmer. As such, the levels of water which are measured should be taken as conservative values <br />because the total area being irrigated will be reduced as mining progresses. To the southwest of the <br />permit area, there is an outcropping of shale on the surface. This coupled with the dip of the shale, it <br />can be seen that the outlying area which irrigates towards the permit area is relatively small. See <br />Map B-2. <br />Haldorson Sand and Grave] Mine <br />