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1 <br />BATTLE MOUNTAIN RESOURCES, SAN LUIS PROJECT <br />CMLRD ADEQUACY LETTER RESPONSES <br />Page 20 of 28 <br />37. Please describe briefly the diversion, sediment control, and drainage <br />crossing maintenance plan. <br />RESPONSE: The diversions, sediment control facilities, and drainage crossings <br />will be periodically inspected and maintained. The systems will be <br />' inspected each spring and after heavy rain storms to determine the <br />need for maintenance or erosion control. Sediment will be removed <br />at least annually and placed on the active waste rock disposal areas. <br />Culverts have been sloped to ensure self cleaning but will be checked <br />t for clogging. Erosion will be controlled through regrading or <br />reseeding as appropriate. <br />t 38. Please describe the chemical composition of the water contained at <br />the collection pond and on the tailings surface. If the chemical <br />analysis indicates that these waters are toxic to waterfowl, Battle <br />t Mountain must submit a plan to minimize waterfowl contact. In <br />addition, a deer and elk proof fence around the collection pond may <br />be necessary, depending upon the potential toxicity to wildlife, and <br />to ensure liner protection. <br />RESPONSE: The chemical composition of the tailings water is included as <br />Attachment I. As shown in the data submitted for Attachment 1 and <br />' discussed in the response to Question 2, the expected free cyanide <br />concentration is less than 4.4 ppm. The recognized toxicity level <br />for waterfowl for cyanide has been determined to be approximately <br />50 ppm free cyanide. The State of Nevada has adopted this number to <br />t determine when a pond required waterfowl protection. T'he San Luis <br />tailings water is an order of magnitude less that this standard and <br />should not present a hazard to waterfowl or require waterfowl <br />' protection. <br />As discussed on page D-76 a seven-ft high fence will be installed <br />around the collection pond sufficient to protect wildlife and ensure <br />' liner protection. <br /> <br /> <br /> <br /> <br />1 <br />