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ocT-zs-ss ruE 12: sa F~n <br />>~ <br />JttErhttcU i11LLrtt rrln <br />s <br />D. tv. Bto.es and 1. L Jambar <br />yiU «J Ilrl <br /> <br />f'. 1 r <br />door <br />4rlia. <br />araun <br />dkgii <br />aigtte <br />the di <br />attalR <br />and a <br />obser <br />~~ <br />Hy. <br />iodic <br />day t <br />efHry <br />(.a x <br />fla. 1. Inndao of the W aLLe Amulet audy ern, aM plan .ia.-of the v~7inas impoundment and tad <br />draiaaae system. Cored bonhotas ate shwa try atteddrees. _ <br />std[ilde-osidation trYtiats aavr. Geachettsiol <br />analysis of the tailings pate .eater provide infitr- <br />matian macerniag the tGsut~ratioa ford oontxn- <br />tntioas of dissolved mttstitnents within the wTiags, <br />aril provide as iadigtion of the rate o[ tatliagsprne- <br />ratu titavetxat Pore-water and pore-gas eiterttlstry <br />data. whey tombiaed with getxhemical-spedanoa <br />orals-traasfu modelling, provide an iadirrtion of fhc <br />geochemid egtu7ibrium reaction eaouatling the <br />mnoenttatiaas o[ divdved tpavtituents. Analysis of <br />the rulings muds indttates the extent of sulfide <br />weathering, the mture d the nujor secondary pre- <br />QpltaleY, aad the 11]In7e aad Giie11[ M a0tt- <br />aquRtlrrittm ltacsions such as ylitate dissolution aad <br />replacement rt:aetioas. One of the principal valuaof <br />minerabgiol analysis is that it defituti.ely deter <br />mixes the presence both of the primary a~ seeoad- <br />ary mieetals, the prcseacr of which ue Drily itdcrred <br />is the geoeltemietl modelling. Consequently, <br />tletaQed mfaeralogfal analysis of die taiLagr solids <br />conducted m eonjuoction with detasled pore-water <br />~ P~-9u ~y~ Pmriele greater insight iota the <br />[utvre geo~emital t:volertion of the tailings than <br />tither o[ the two approaches mold isdepeadently. <br />Sflg DPSdtl!'T10N AND IsYDROGEOLOGIGI. <br />SEITINC <br />The Waim Amulet w7irtgs arc lasted -20 km <br />wen of RauytFNoranda, Quebec, in an ma of cool <br />and htuaid climate. TAa depth of thr a(-ha impouml- <br />mmt (Fg. I) taages Srom 2 m n the impoundment <br />margins m >(S m in the omtm (D.avt a d., 1986). <br />The aafaa of the taslmgs supports a lush vegetative <br />Cava which was developed to stage from 1978 m <br />1981 by the addition of uQ m ds Jha of agtimlwral <br />littauotee, and aP w 2.2 dha of fertilizer. Runoft <br />generated from the impoundment tlowa through . <br />smatl streams ro a wllectiat pond 'and water- <br />trattaeat tatiliry adjauncto the iag+ouadment (Fig. <br />1). <br />Although the Waite Amine! null proeesed ore <br />from 10 tiifferrnt ore bodies. a0 were of taasaive- <br />wlflde type and afl cbntauted between 60 aad 90Y. <br />sulfide minerals aril magnetite. Pyrite, pyrrhotite, <br />spha4ritc and dnlcopyrite were the ptedomiaant <br />srtl(ides. Galena, native st7va, atrsalite aad doarum <br />were otegcniaed b1 Paten and Bnaoort (19x8) as <br />minor eeastiturnes eN the ore. These ttrieerals, plta <br />others, including tutire bismuth, bismuthiaim, «xra- <br />hedrite, staanite and txstsrite, have ben tsbscrved <br />in the tailings. The priodpal host rocks were aadesite <br />std rhyoGte flows and brccaa5 err by felsic to inrer- <br />ttxthate dykes. The principal gaagoe minerals, u <br />timW m she taBistSs, arc silicates such u quarrs, <br />chkai[e, mmcwite, tale, feldspar and pyroxtae. <br />T1se major steps io the tmllina process were grind- <br />ing, aeration std (lotadoa. The ore was ground to <br />about 70% minor 200 atesh. Aggressive dtemid <br />rwgeats intended a diaolve ore; minerals were oa <br />toed; as a conxqueaee, the sulfide aad s7iote gan- <br />gue mintsals probably passed mto Ne tas7stsgs <br />impoundment telativdy tmaSected. The tatlittgs and <br />wale preass-water were uaasporsed by pipelive <br />tarn er <br />4or N <br />tkya <br />talim <br />awm <br />vettic <br />weer <br />ontw: <br />Evti¢ <br />tNa it <br />4ilirc <br />sma11 <br />j111M <br />(~~ <br />m <br />>a <br />aso <br />i <br /> <br />