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OCT-29-96 TUE 12 38 PM SHEPHERD MILLER FRn NU, 970 223 7171 <br />Yore .uv ~ ty. ralAde taillvgs, Wda.lmdar. 0eebec ~ 335 <br />lad Jloaau (1985), and tha[ iofarred ~m the <br />analytical soltttiaa of Dave and Rnaa: (I986) is <br />class <br />A suable diflareace betwaaa the ttteast[ted and <br />talrnlated Or plumes o that the aaalydeal solution <br />noes rtes simukte the mnrave-aprard portiw of me <br />0. profile araasurtd a[ piesometer nest WAS2. This <br />may be a wttsagtamm d aastmlDg a mtesrant dit- <br />[ttaioa weffidetn is the pat. seam of the tailings <br />(Ot). The moisture mnrent d the tailings ;eaerally <br />htaeases with iatxaaiag depth, and would result is a <br />pester than arenp di8utioa eoefidea and thus <br />grater oxygta ptaetntian am the nr7ings surface. <br />The mode! presented by Dew and Rrtcroa (1986) <br />m be used to estimate X' (t), the depth d a mov(ttg <br />plena tronc above arhith all the sulfide has olddihed. <br />The horssonul tfashed fine oo the promo far wA11. <br />WAIT and WAII m Fg. 6 iadltatas the akulated <br />depth of this plane. The taltadated depth corrc• <br />ipoods doscly to the obsmed decease m sulfide <br />alterrtioh index u piesometrr vats WA37 and <br />WA22. The agitamen[ b sot es food u pkztrrtreter <br />nts WAll. This may reflect madegtude d the <br />model or pantrteta setectiao. or tray result from <br />etthaaaed ox(dation due to diLtge d the wliags <br />during the rcvegentioe program. <br />The depth of sulfidemiaeral depkaoc is ptxtest <br />at WA22. where the oxygen d8usiviry b largest <br />(bwert moisNte mntem). This is is geaaat ag~ee- <br />meat with minenloaiol oDservanom. where the <br />tu7inga ue Anagrained and the water obk a shal- <br />law, Indng ro a low Or diQmivity, the Zone ptacvve <br />sulfide oxidation. the intamesiiate~mtre, a thin m <br />absent (WA2. Fg. 3), and. where the nrTings iue~ <br />ooatse andthe water mble is deep, leading tr a hi;her <br />Or dlfftrsiviry (wA17 sad WA22) _tDe itatehtedWCe <br />zone a mnch thicker. A simt7ar rtdacoa bttwefea the <br />oxidatioo profile and the tatliags pain sqe sad moist- <br />ure mount was rcmptized by Saran (1981) st the <br />Nordk mine U•tar'4ngs impoundment, near EUiot <br />Wee, Ontario. <br />Finally, D+ns sad RRCNIE (]9Q6) indinte that y, <br />the dins required m oxidize the total sulfide~itieral <br />content of a thickness (L) d the mine tvasu, m be <br />atima[cd icing the approximate analytietl soludon <br />through the equation <br />7 <br />y " ~D~ (9) <br />The time regtdrM [or mmpkse wddation of all <br />sulfide mnraioed abo.a the water nbM u pica. <br />otaeru rtes wAll, wAI7 sad wAa .aa ealar <br />Ltcd ugag the ttrrea O, valna ptr5ea¢d is Tables 3 <br />and the tasTmgs dtanctnistia snmmaeired in Table <br />L Thc aknlat[ons ssatata that the vadese zone <br />maeads hum the taalinp mrfaee to the watt[-tables <br />ptmdoa shown jn Fig. 3, that the ~W 6atmaitys <br />txmtant,witl[ depth. std thu Or(11 b tha aNy <br />significant oridant. The ttaatcs ate presented as a <br />range of valves in the Datum row of Tables 3, indi- <br />asf[tg that stdfide oridufan tna continue is the <br />•adose moe of the railmp at piezome[er nests <br />WAI1, Ww17, and WAa for periods al ap to 370 a, <br />640 a and 460 a, resjmivdy. These values wan <br />olmtattd toting the appeodma[e atralytiol sotutioa <br />d Davo std Rt7am (198 and the measured attd <br />estimated eharacxerstaa d the hiliap. ti pret6c- <br />tioas, that cakvlatioas aanot be snbstandated <br />~7. Tls apeemrnt between the pret5cted and <br />measured Dt valtw (I'abk 3), estimated from the <br />&u 25-a d sdtide oxidation,- ntggrsts that -the <br />approtdmaae analytical solution provide a rcasar <br />abk detaipuoo dche sulfides osidatioo proc~a[ the <br />wane Amulet era The D, values teed m the olcv- <br />kticu d ehe y va)ua is Tattle 3 wer4 t3timated (tom <br />the upper 40®dthe nlliagt. As the oratfadoo front <br />tnovet deeps mto the tarTmgs, approaehieg the <br />soarer table, the moisture ooareat of the 4t3ngs at dx <br />depth of oridation n'A ieQeate and the value d D, <br />rip decease. Thu mlauoes presented m Table 3 <br />'therefore are conaervadva, sad h is GkelY that sttlAde <br />oxidaCOO wtL amrad for ao e+m longer period. <br />SoJvbi6y eanmrG on pores-warp mntmo~onr and <br />rke formation of srcondary mirsrratr <br />The prirxipal etivitonmcnal problems assoiated <br />with the sulfite tailings u the waste Amtrkt sits an <br />the potential for add geoeracioo and the irrceased <br />oaobmry o[ Cu. PD, 7a, G atM Co undo bw-pH <br />cvndiriorn. Uadastantiiag the yeocherttutry of the <br />wwn o, % ~ won 0 % WAZZ 0 % <br />ee •.o toes sea o.o A.s m.e ~sn.e ae ao roes re.e <br />e.s ~ ee ~ ee <br />- <br />'~ u tot u <br />S <br />s <br />G ze ze u <br />so so >A <br />fie.6.OsYZrnconcentratiotts.adcpth at footiom Wwll. WAl7atidwA22she.rlnaalwbuo(mtaewa <br />arrve) one memured (filled moles) O: rattler The dashed line intGgw the pesidoe of the plain of acti.e <br />osidation altvlated mina the avalytid solutim d D..ts and Raaua (39te). <br /> <br />