ENFORCE30512 - Laserfiche WebLink

Home Browse Search

. , • ~ I ~X~tl~!lf BATTLE MOUNTAIN RESOURCES, SAN LUIS PROJECT CMLRD ADEQUACY LETTER RESPONSES Page 20 of 28 37. Please describe briefly the diversion, sediment control,''. and drainage crossing maintenance plan. RESPONSE: The diversions, sediment control facilities, and drain ge crossings will be periodically inspected and maintained. The systems will be inspected each spring and after heavy rain storms to etermine the need for maintenance or erosion control. Sediment wil be removed at least annually and placed on the active waste rock di posal areas. Culverts have been sloped to ensure self cleaning but wi 1 be checked for clogging. Erosion will be controlled through egrading or reseeding as appropriate. 38. Please describe the chemical composition of the water ontained at the collection pond and on the tailings surface. If he chemical analysis indicates that these waters are toxic to Ovate owl, Battle Mountain must submit a plan to minimize waterfowl contact. In addition, a deer and e]k proof fence around the collection pond may be necessary, depending upon the potential toxicity to ildlife, and to ensure liner protection. RESPONSE: The_ chemical composition of the tailings water is lincluded as discussed in the response to Question 2. the expected Ifree cvanide concentration is less tnan a.4 ppm. ine recog m zep to icity level for waterfowl for cyanide has been determined to be a proximately 50 ppm free cyanide. The State of Nevada has adopted this number to determine when a pond required waterfowl protection. he San Luis tailings water is an order of magnitude less that this ¢tandard and should not present a hazard to waterfowl or requi~ie waterfowl protection. As discussed on page D-76 a seven-ft high fence will a installed around the collection pond sufficient to protect wildli a and ensure liner protection.