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. ~ to u n•USAM massey- 3034267780 ;# 4/ 7 auvi nT•mss ~ ~ _lZ_ I The buttress Itself wi11 be eanstructedlof durable rotk materials wnich is the waste material from the pft area. !tits designed as a free drainfng structure and, to facilitate that, a filter fabric will be pt aced between the buttress materials and the highwall to ensure that there would not be buildup of head on the highwaTl side xhich xould coca romise the integrity of the buttress. The overall taetor of Safety for ~he south wa11 with me buttress in place is increased W about 1.8. That's fi~lIver the long term, Regarding the slurry wall, t need to mak~a a correction iota the record as is xhat we xere referring to this as last month. We referred to it the record as a grout curtain and iTere's a difference between a grout curtain ana a slurry wail. The proposal, we11, the Laapany;coamitment at thls point, would be to install a slurry wall at the sits ad,iaclnt to the Rito Se co alluvium in the vacinl>~y of the south watt of .the West pit. The ac trial purpose of the -- the actuai proposal is to build a south wall mr the slurry wall so as to inhibit aqy inflows of alluvial waters from rile Rita Seto alluvium tote the South Pft or the West Pit, I'm sorry. ' Data submitted to the Division tndicates~that inflows could be expected up i>z l25 gallons per minute. However, this i~,s data from one hate and it's not, cannot De precisely determined. I think 'this is an estimate the: we are using t:0 go with, Based on this information, the Division does feel that the -_ slurry, wall would be necessary xA ensure that,ifirst of P, the hydrologic - balance of the alluvium material would not be Materially disrupted at post mining and that during mining, the opera ti an wQuid remain essentially dry. Battle Mountain Resources has submitted a typi4al slurry wa11 design, the exact spe^_ifications of file design have not been submitted and wi11 oat be sutmitted until the actual need for the trench~is determined mr the slurry wall is determined. We will determine the necessal for this Murry wall about tyro years after an excavation 1s completed. This excavation would essentially oe a Lrench in the alluvial materials in the vicinity of the south wall of the West lit. [C's felt by the Staff, Drat Lhis would bg the best method to determine tiVie necessity and to determine the actual infloir rate and volumes, if any, into the pit area. With that in mind, the Company has committed to 1 'I