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<br />1 <br /> <br /> <br /> <br /> <br />t <br /> <br />1 <br />1 <br />II <br /> <br />L <br />1 <br /> <br />1 <br /> <br /> <br />BATTLE MOUNTAIN RESOURCES, SAN LUIS PROJECT <br />CMLRD ADEQUACY LETTER RESPONSES <br />Page 17 of 28 <br />26. Pease provide a sliding wedge stability analysis for the main <br />embankment at Phase 2, Raise 1 and Phase 2, Raise 2. <br />RESPONSE: The sliding wedge stability analysis for the main embankment is <br />provided on the revised Figure D.6-9, Sliding Wedge Stability <br />Summary. <br />27. Please revise the stability analysis summary in Figure D.6-12 to <br />include the VLDPE instead of the material type 1 as foundation <br />material. <br />RESPONSE: Figure D.6-12 has been revised to include the iILDPE instead of <br />Material Type 1 as foundation material. The revised figure is <br />included here. <br />28. Please provide a stability analysis of Waste Rock Disposal Area D, <br />similar to those provided for the other waste rock facil+ties in the <br />approved application. <br />RESPONSE: The stability analysis for Waste Rock Disposal Area D is provided <br />in Figure D.3-2. This analysis did not include an analysis of the <br />single bench static and pseudostatic factors of safety. A revised <br />Figure D.3-2 is provided with this submittal. <br />29. Please describe what methods will be used to validate the assumption <br />that unsaturated conditions will be maintained within the embankment <br />fill throughout the life of the facility. Piezometers should be <br />placed within the embankment, and within the tails adjacent to the <br />embankment inslope to verify the design assumptions. <br />RESPONSE: A series of pneumatic piezometers will be placed beneath the <br />embankment, at the upstream toe of the embankment and within the <br />beach sands deposited on the upstream slope of the embankment. <br />30. The model assumes 50% of the tailings disposal area is under <br />deposition at any point in time and thus 50% of the area will be <br />,, F evaporating. How many days wi 11 an area of tai 1 ings be dry and <br />~~'",°°as"~ Subject to wind erosion? What would be the maximum extent (acres) <br />s°' of area with moisture conditions conducive to wind erosion and <br />resultant dust generation? What measures, aside from residual <br />moisture, will be used for dust control? <br />RESPONSE: Once the area of tailings approaches desiccation and begins to dry <br />at the surface, this is an indication that the thin layer deposition <br />concept is working properly and that the area is ready far the next <br />thin layer to be deposited. Dust generation at the facility will be <br />controlled through the active management of the thin layer deposition <br />techniques. As an area dries out, the spigots will be reopened and <br />more slurry deposited, preventing dust generation. <br />