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<br />Battle Mountain Gold <br />NOPV Abatement Requirements <br />page 3 <br />TR-004 Stipulations: <br />(1) Requires submittal of additional information addresasing BMG's <br />desire to amend the tailings pond cyanide compliande <br />standard. Recommended submittal by April 17, 1992 '(NOT MET). <br />(2) BMG shall continue "CYTOX" treatment of the tailin s slurry <br />within the tailings impoundment until the approved permit <br />cyanide concentration limitations of 4.4 ppm for t tal <br />cyanide and 3.8 ppm for weak acid dissociable cyani a are <br />achieved, or until the Division orders cessation [S a above <br />Board imposed deadlines]. <br />(3) Additional monitoring points. <br />(5) Leak Detection System Effluent Containment: <br />In the event that fluid is intercepted <br />pond liner leak detection system, BMG <br />automated system to minimize the Bevel <br />within the leak detection system. Thi <br />likelihood of compromising the seconda <br />withdrawing leakage. <br />In the event that C <br />effluent, BMG shall <br />all effluent to the <br />the environment. <br />Status: Satisfied <br />by the tailings fluid cohlection <br />shall design and implement an <br />opment of hydraulic back ressure <br />s system is intended to r duce the <br />ry clay liner by intercep ing and <br />yanide is detected within the leak detection system " <br />design and implement a containment system t~ return <br />tailings impoundment, in order to prevent i pact to <br />- BMG has committed to repair of the primary liner if <br />a leak is detected in letter of April 16, 1992. <br />(6) Cyanide Detection, Interception, Containment and Remedial Treatr~ent: <br />BMG originally proposed the construction of a heap leach at the San Luis <br />mine. In 1988, BMG amended its permit application to delete th heap <br />leach and implement a contained vat processing system. This am nded <br />process was designed to yield detoxified tailings for disposal Within the <br />tailings area. BMG replaced the originally proposed heap leach double <br />liner system with leak detection with a composite liner system ~ithout <br />leak detection. This amendment was approved by the Division re ying upon <br />BMG's representation that tailings Cyanide levels would not exc ed 3.8 <br />ppm WAD Cyanide and 4.4 ppm total Cyanide. <br />In the absence of a leak detection system, migrating leakage fr m the <br />tailings disposal ponds would only be detected by the five grou d water <br />monitoring wells (M-5, M-6, M-7, M-8 and M-9) located in the vi inity of <br />the tailings area. Since the inception of the approved monitoring <br />program, only monitoring well M-9 has intercepted ground water. The <br />