Laserfiche WebLink
Section 13 <br />Geochemical Data and Analysis <br />• dominant mechanisms controlling the volume of percolation through the <br />development rock areas. Minor differences in the physical characteristics and the <br />magnitude of annual precipitation are less important controls on the expected volume <br />of percolation. <br />The results of these estimates correspond to the input parameters including the <br />development rock physical and hydrologic parameters, and the available climate <br />data. Site-specific climate data are not available for the West Sunday and Topaz <br />mines, and differences between actual climate conditions at the site and the data <br />compiled from the Uravan and Montrose weather stations could result in variations in <br />percolation through the piles. There are other site-specific variations that are not <br />directly accounted for in the model. For example, a rind of highly compacted tight <br />soil/rock was encountered at the surface of the rock piles. This rind likely reduces <br />infiltration by allowing for increase runoff and increased surface evaporation via <br />ponding versus infiltration. This site-specific condition (which could further reduce <br />modeled percolation rates) was not accounted for in the model. <br />r1 <br />LJ <br />• <br />13-10 <br />7:164986-Denison MineslTask Order 4 - EPP Sunday Mines Group1FINAL EPPTINAL - Environmental Protection Plan Sunday Mines.doc