Laserfiche WebLink
~~ • • <br />L_ <br />SECTION 1.0 '~'~ <br />v~/J5 I ~~. -f S <br />INTRODUCTION ~ ~I ~~ ,n~ l r /r ~, „r I /~ <br />/~ ; <br />D' xH~' .~,rsti~~ ~° <br />i.,w, <br />Permits granted to Battle Mountain Gold Company (BMGC) for the San <br />Luis Project, near San Luis, Colorado stipulate tat tailings <br />discharged from the plant to the tailings impoundmen shall have <br />a pH in the range 8.5 - 8.4. To achieve this, a Tailings pH <br />Adjustment System has been incorporated into the plant design. <br />The tailings slurry pH is reduced from 11.1 to 8.5 8.9 by the <br />addition of sulfuric acid. The reaction between t e acid and <br />residual sodium cyanide in the slurry generates ighly toxic <br />hydrogen cyanide gas (HCN). The HCN evolved is captured by <br />scrubbing with sodium hydroxide solution, and the resu ting sodium <br />AIL cyanide returned to the leaching circuit. The sys em has been <br />designed to ensure that it is reliable and does not present any <br />danger to employees. This report analyzes the p tential for <br />I hazards due to possible malfunction of equipment or ontrols, or <br />to errors by operators. <br />I <br />i <br />[; <br />I, <br />r pj/1475rp 012591 <br />1-1 <br />l~~ <br />1 ~ ~ !, <br />i,,, ~- <br />i V <br />h ~ .h/ <br /> <br />