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1 <br /> <br />1 <br /> <br /> <br />i <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br />BATTLE MOUNTAIN RESOURCES, SAN LUIS PROJECT <br />CMLRD ADEQUACY LETTER RESPONSES <br />Page 22 of 2B <br />Concurrently with flow reduction of process related chemicals the <br />chemical makeup of the solution is anticipated to change. Reduction <br />in free cyanide levels and a decrease in total dissolved solids is <br />anticipated through natural geochemical reactions. Precipitation on <br />the embankment will result in infiltration and subsequent drainage <br />from the embankment. Periodically, following rainfall events and <br />seasonally following snowmelt, an increase in flow from the drain <br />network will occur. This flow will reflect similar water quality to <br />the groundwater of the project area. <br />As the drainage rate decreases the potential for leakage from the <br />liner system will also decrease. Both the source of seepage and the <br />hydraulic head applied to the liner will reduce. The long-term <br />potential of seepage is, therefore, less than the operational <br />conditions discussed in Response 11. <br />Post reclamation infiltration over the surface of the facility is <br />predicted to be minimal, even following major storm events. Routing <br />of storm water out of the facility will occur within a short period <br />following the storm. The bulk of infiltration is also anticipated <br />to be removed from the upper surface layer of the reclaimed area by <br />the evapotranspiration process. No detectable effect of infiltration <br />over the facility's surface following reclamation is predicted. <br />Based upon the extremely low level of potential seepage or flow <br />predicted from the facility following reclamation, no modelling is <br />considered necessary. <br />40. The final topography on the tailings surface is described as being <br />created by selective deposition at the end of operations such that <br />only minor grading is expected prior to topsoii placement and <br />revegetation. It is noted in Appendix L (Spillway Design <br />Calculations) that the reclamation plan may spigot clean <br />material and seed, rather than using earth movers to grade the <br />surface." Piease clarify the method proposed for topsoil distribution <br />and seeding on the tailings surface. <br />RESPONSE: The method proposed for topsoil distribution and seeding on the <br />tailings surface is, as described on pages E-3 and E-5, initially <br />selective deposition, followed by minor grading, and finally topsoil <br />placement and revegetation. The method described in Appendix L is <br />incorrect and has been deleted from the text. <br />r <br />