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lt. Process Description <br />prom past and on goicg test prograris,the most cconamical aetho.i ~.~ <br />erect tho mine dischar8o includes chcuiu,l nddition, eo:,ruL,l.ion, oxidati,~n ;nul <br />separatton of heavy metal prccipitotos. idmo is add cal to the dlscht,rgo t~~ raiso <br />tho pH high enough for the forwntioa of zinc hydroxide ..Lich is thou coagnl:,tcd <br />by poiyvets~and separated from{ the effluent in a liltcr h,•d or standard typ~• <br />thickener. ~ <br />i <br />Approx[mately 98 porcont of tho soluhlc zinc. i~, rcmnvod at n pll of <br />8 - d.5 with a limo ciasago of 25 - SO mg. per liter. S.•i,., r;,n t;P-IO was used us <br />tho polymer to congulato the zinc hydroxide nncl , do~~arc c.f 0.3 mg. por liter <br />vas found to De sufficient. <br />t <br />i III. tiatcrgi,ati;y <br />from many sets of analysis average discharge rancentraLions of the <br />mine xater !s as fotlova: <br />1 - C•xisting Discharge Conccntrntim,s - <br />1 (ln mg/I.) <br />Parameter Concentrntim, kl'!)LS l.i mitnt is+rs <br />Suspended Solids <br />Iron <br />Load <br />zinc <br />Cadmiwe <br />Copper ~ <br />Mercury <br />011 6 Crease <br />15.2 2: <br />O.A Z.0 <br />o.iz o.z <br />7.5i D.s~ <br />o. oz n.oz <br />lass 17,an 0.1 Y O.OSR <br />loss !han 0.001 0.001 <br />loss than 0.1 0.1 <br />IV. EfEcct of IFntcr 1'rcatr.,ent <br />, -- <br />,'fhe Bulldo; Mino discharge contributes only minor amounts of pollutants <br />to tha Millov Croek Bnsin. 8y troating tho mine disclwrgc,only a small improrc- <br />mont in the drainage viii be roalized but under tl,c f;l'Uf:S I'crmit requirements, <br />treatment is mandatory. Mt. {Fights coveri.n~ letter is attached to this report <br />for your ~eference. <br />t <br />f <br />i <br />- 151 - <br /> <br />