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-S-
<br />reletiral) smell relume o[ ova Ss being leeched ec en) gf ran c1me. Th1e
<br />greed) reduces tha amount o[ pregne nc solo clon Sn the s)acem. Secendl),
<br />since the teilinga 1n ell o[ the underl)1ng leyen he•e been closed end
<br />neutreli:ed, then Ss no source of conte.lne tee to conuml na ce the min veers
<br />that in[1lcrete thouth the aides o[ the hoe p. Thirdly, [he tell nature of
<br />this system reduces the ^ree on vhlch rain can fall end produce contemineted
<br />or non-contemineted voters. The small base ores o[ these heaps also afnlmf:aa
<br />the dl sturbence of •Sre1n lend srees. Fou r[hl), the eel luler heap design
<br />end mode o[ operetf on ellminotes the need for ell leach solution end contem-
<br />lneted rein reserrofro and solution treatment [ec111t1es. Sixthly, the CH
<br />Leech log system's 1n[ernel plumbing system makes it Dossible to monitor ever)
<br />cell In the system on a cell-by-cell basis for side and top leakage.
<br />CN Leach cep! tel, operatl ng end en•lronmen[el costs should be cons! derebl)
<br />less then [hose o[ other heap leech systems. Ce pi tel costs ere lov Decease
<br />Its bottom pad 1s much smeller than those of other systems, ell reservoirs'
<br />ere ellmine tad, ]and and voter req ulrements are minimal, less roads need to
<br />be bulls end the capital costs for [he metal recovery [ecilitles ere releti•ely
<br />lov (the Dr ogressl•e, nulcl-stage recirc uletf on of CH Leech liquors Droduces
<br />e small volume of highly-concentrated gold end si 1•er solutf ons). CH Leech
<br />operating costs would be reletl•e1T low because of the increased gold rmorerio,
<br />reduced reagent and voter consumptl ons, reduced pumping costs, simplified and
<br />more ef[ecti•e vi nter operations, etc. Enrlronmencal cost savings would loci ode
<br />the cos[ incurred in containing and treat log large volumes of contaminated
<br />solutions over long Derl ods of [1me, greatly reduced risk o[ leakage end spills
<br />reduced monl coring costs end ell costs that ere related to melntel ning [aroraDle
<br />public re le[ions and Derm/flog.
<br />COHPARATI VE ElAlIPLFS
<br />A (ev compare [1•e calculations (note Table 1) have been made the[ 111us Crete
<br />the dimensions of tompereble-si xed hypothetlcel PH end CH Leach plants that
<br />ere located in en enrl comment ally-senstci•e area.
<br />These date show the base Brea o[ the PN Leech plan[ to be 2.77 times
<br />[het of the CN Leech [eci llty, the PH Leech plant needs reser•o1r that is
<br />ebou[ 1/3rd the area o[ SCS leech heap plus solution treatment fec111t1es
<br />end the CH Leech plant needs neither of these, end the total cost o[ bottom
<br />pads and PYC interline ra would be ebou[ the same 1n the two srs[ems. At least
<br />51.15 more per ton Sn gold values would probably be recovered 1n th.s CH Leach
<br />system.
<br />F3CES$ CONTAMINATED SOLUFIONS
<br />-~-
<br />The bl ggest problem vith heap leeching Cods) Sa what to do
<br />rl th the large rolumee o[ access contemineted solutions that are generated
<br />b) the system during perfods o[ closure, b) sudden large rainstorss end
<br />after leeching operations cesse.
<br />In the past, poorly-rinsed RH tell] ng9 were stacked Sn unlined heaps
<br />chef elloved the access conteml meted solutions to seep 1n[o the ground under
<br />them and PH plants simply dlachsrged then to [he en rlronment.
<br />Today, hoverer, ecqul[ers that underlie ]each heaps must be pro! ecred
<br />from this content natl on. Vith the present technology, the only solution
<br />Ss [o Conte In these solutions in rev) large reser•ol rs end treat or era porate
<br />thee. !lost landfills end men) other types of mineral processing (ecilit ies
<br />In [he Unitad States face [he same problems.( d 5)
<br />REFERENCES
<br />1. U.S. Pa tart No. 4,526,615, July 2, 1985, "Cellular Neap Leach Process and
<br />Apparatus". Also patented 1n Chile and Peru. Inventor is P.H. Johnson.
<br />2. Johnson, P.H., "The Cellular Heap (CH) Leaching and Cyanide Regenera [ton,
<br />Contaminant Remo•el end Metal Recovery (CRIlIR) Processes". Paper Dresented
<br />et Annual AI[IF, meeting, Harsh 1. 1984,
<br />7. "Cellular Heap (CH) Leaching of Sandstone Uranium Ores".
<br />November 6, 1984. Unpublished paper. Johnson Research and Development
<br />Corp., llc Inc osh, NH.
<br />4. U.S. Patent Pending, "Cellulsr Landf 111 Process and Apparatus'. Filed in
<br />1991. Inventor is P.H. Johnson.
<br />5• "Summary Report on The Cellular Landfill". Unpublrsli r it rrpor[.
<br />Johnson Research and De re lopmen[ Corp., 1992. Nclntosh, NlI.
<br />A free copy of any of these Dublications can be obtained by writ log
<br />Johnson Research end Development Corporatl on, PO Bor 31, rlc ins osh, NlI, 87032.
<br />TABLE 1. Comparative PII and CN Leach Facilities. •
<br />Drs ¢x D.re no:rtt t [u•uu r
<br />rr re el Xnr loch onto hru.rq Xo} 611ubr xnr
<br />trim to [co]lt] one Drr-[c t'er D,r'3. lye
<br />real reer.e. re srrtr.., rern tee, to.aa.goo ro.oce
<br />:.n
<br />ur. or o,.eear. nn. .
<br />M1ebu bn 4u, reo.r u • Pr eq Iles 6
<br />a .r/P) 11!0 e'!0
<br />Orr Cr Jr, art .. O.OIJ
<br />aoa
<br />D,n•. rr c,.,mn. r.r e.r D/e
<br />`
<br />c.ert r.a /m..n te. .r .
<br />.r n r :~
<br />r
<br />n.. r.r. x.rr xa rot. r.a fo rev
<br />Xrq 4sr b,,, rtr r. ]ID 11:
<br />Wtnl.r M1rle.. Iqe .rtt e.. ]f Jf
<br />u... r.u.r. en' o ro
<br />4.e.r er 6u. e. mr 6.c.e1 .re u...e set rrrliael. r-r
<br />nn rru. [.. .rrr trrr voice l0 4re, xu ,•• ee o
<br />Im.reo ro .err 40 4,61 lu 6ux Sel 'n. to >0 0
<br />in rl x„1 u. b. r.elr rrPlr,r bier
<br />a
<br />t IDs p
<br />4PS.WU eric
<br />In,m rot bt
<br />bw err n. x !).n00. o00•• D
<br />r.n e. r.e r.e uxr rr rvm....xr.. sr. n. rtee
<br />eto••• ;er
<br />ro .u nc Irt,n rerr r.rve..e.rt., s.. n. .
<br />nex o .
<br />. re
<br />nn..,ee wu 4re.u l.r, rvrtot n er
<br />4u.r,r1 to 11 rdvo r 3)50.00br, 3/wM e4r r.,;
<br />rhr reef • np bit e. Inlluent rru x e' rrinnao
<br />uto.oaon.... Da.. r t save. re6.rrt.
<br />•• De., art r.a.b rye erbr ,.n,.ert..
<br />
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