COMPAÑIA MINERA SANTA ROSA SCM PROJECT Nº 2176 LOBO MARTE PROJECT PREFEASIBILITY
TECHNICAL REPORT Nº 2176U-00-TR-001 FOR TRADE – OFF FOR F OR HPGR CRUSHING Prepared by
AMEC In!"n#$%n#& 'C($&!) S*A. Approved by
Gerente de Proyecto Cliente
Tony Maycock Erling Vill Villa alobo lo bos s
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Coordinación Interna Client approval
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T A BL E OF C ON TE NS NS PAGE
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CI*CIT -E&C*IPTI,+ A+-E&C*IPTI,+ A+- -E&IG+ C*ITE*IA ....................................................................... 3 .! Circ"it description................................................................................................................ description................................................................................................................3 3 .# -esign Criteria .................................................................................................................. ..................................................................................................................!$ !$
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TE&T5,*6 ................................................................................................................................... ...................................................................................................................................! !! 1.! )PG* testing at &G& 4ake7ield ........................................................................................ !! 1.# )PG* Testing at Polysi"s ................................................................................................ ................................................................................................! ! 1. Polysi"s E8"ip'ent *eco''endation ............................................................................. !9
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T ABLES Table #=! Process ,perating Costs by Cost Type ...................................................................................... : Table #=# Cape> Co'parison by -iscipline ................................................................................................. .................................................................................................: : Table #= ;inancial Analysis *es"lts ........................................................................................................... ...........................................................................................................9 9 Table #=/ Prod"ction and ;inancial &"''ary............................................................................................. 3 Table 1=! &a'ple -escriptions .................................................................................................................. !! Table 1=# ;eed C?aracteristics .................................................................................................................. ..................................................................................................................!# !# Table :=! Process ,perating Costs by Cost Type .................................................................................... !9 Table 9=! Cape> Co'parison by -iscipline ............................................................................................... !3 Table 9=# Cape> Co'parison by Area..................... by Area..................... ............................. ......................... ............................!3 ............................!3 Table 3=! ;inancial Analysis *es"lts ......................................................................................................... .........................................................................................................!< !< Table 3=# Cas? Costs Vers"s Gold recovery............................................................................................. recovery.............................................................................................#$ #$ Table 3= Prod"ction -ata .........................................................................................................................## Table 3=/ Prod"ction and ;inancial &"''ary........................................................................................... ##
FIGURE S
;ig"re #=! PG* &i'"lated Prod"ct &i@e -istrib"tion................................................................................ 1 ;ig"re =! &i'pli7ied ;lo2s?eet................................................................................................................... < ;ig"re 1=! Cr"s?ing Test2ork *es"lts....................................................................................................... ! ;ig"re 1=# Polysi"s Test Progra' &"''ary ............................................................................................. !/ ;ig"re 1= PG* ;eed and Total Prod"ct &i@e -istrib"tions.................................................................... !1 ;ig"re 1=/ PG* ;eed and Centre Prod"ct &i@e -istrib"tions................................................................. !1 ;ig"re 1=1( )PG* &i'"lated Prod"ct &i@e -istrib"tion.............................................................................. !:
PG* *eport.doc
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T A BL E O F C ON TE NS PAGE APPENDICES
I ;lo2s?eets and -esign Criteria II 4ayo"t III Test2ork *eports IV Cape> -etails V ,pe> -etails VI ;inancial Model
PG* *eport.doc
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INTRODUCTION Minera &anta *osa &CM (6inross) is st"dying t?e 7eas ibility o7 developing t?e 4obo Marte gold deposits located in C?ileBs *egion III !3$ k' to t?e east o7 Copiapó at an altit"de o7 /$$$ 'asl. In recent years ?ig? press"re grinding roll (PG*) cr"s?ers ?ave 7o"nd application in t?e ?ard rock 'ining b"siness. T?is ?as occ"rred beca"se t?e s"ppliers o7 t?ese cr"s?ers ?ave i'proved t?e tec?nology and 'aterials "sed in t?e designs. Typically PG*s ?ave replaced tertiary cone cr"s?ers. In so'e operations secondary cone cr"s?ing 7ollo2ed by PG* tertiary cr"s?ing ?as been "sed instead o7 &AG 'ills to prod"ce ball 'ill 7eed. ;or very ?ard ores signi7icant energy savings ?ave been reported. More relevant to 4obo Marte is t?e "se o7 PG* tertiary cr"s?ing to prod"ce leac? pad 7eed. T?e 'an"7act"rers o7 PG* cr"s?ers ?ave reported t?at t?e co'pressive action o7 t?e grinding rolls not only red"ces t?e particle si@e distrib"tion o7 t?e 7eed 'aterial b"t also prod"ces 'icro=cracking in t?e particles. T?is p?eno'enon 'ay allo2 better contact bet2een t?e cyanide leac? sol"tion and t?e 7ine gold locked 2it?in t?e ore particles t?"s increasing gold recovery. AMEC ?as designed a secondary and tertiary cr"s?ing circ"it 7or t?e 4obo Marte proDect incorporating PG* cr"s?ers in t?e tertiary stage. -esign in7or'ation 2as provided by Polysi"s o7 Ger'any. Polysi"s is a 'aDor s"pplier o7 PG* cr"s?ers. 6inross ?as carried o"t laboratory scale PG* cr"s?ing at &G& 4ake7ield in ,ntario Canada and larger scale tests at Polysi"sB test 7acilities in Ger'any. Cr"s?ed 'aterial 7ro' t?e &G& 2ork is c"rrently being leac?ed in col"'ns at McClelland 4aboratories in t?e &A. Early res"lts indicate t?at ?ig?er recoveries are ac?ieved 7or 4obo s"lp?ides cr"s?ed by PG* co'pared to t?ose obtained 7or cone cr"s?ed 'aterial. +o di77erence ?as been observed on o>ide ore. T?ese res"lts are still to be con7ir'ed. &everal di77erent sa'ples 2ere cr"s?ed at Polysi"s. T?ese are c"rrently being prepared 7or leac?ing and t?e 7inal res"lts are e>pected in +ove'ber-ece'ber #$!$. T?is report provides capital and operating costs 7or an PG* circ"it. ;inancial analysis ?as been carried o"t to deter'ine t?e gold recovery increase t?at 2o"ld be re8"ired to cover t?e increase in capital and operating costs co'pared to conventional cone cr"s?ing. A 7inal report 2ill be iss"ed once t?e gold recovery di77erential ?as been deter'ined bet2een PG* and cone cr"s?ed 'aterial.
*eport
Pgina // de #!
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SUMMARY AMEC ?as carried o"t a trade=o77 st"dy to co'pare ?ig? press"re grinding roll (PG*) cr"s?ers 2it? s?ort ?ead cone cr"s?ers 7or tertiary cr"s?ing in t?e 4obo Marte plant. &o'e ?eap leac? operations ?ave reported ?ig?er 'etal recoveries 7ro' PG* cr"s?ed 'aterial d"e to t?e occ"rrence o7 'icro=cracking in t?e 'ineral particles res"lting 7ro' t?e co'pressive 7orce o7 t?e grinding rolls.
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T!%"3 6inross ?as cond"cted laboratory scale PG* cr"s?ing at &G& 4ake7ield in ,ntario Canada and se'i=ind"strial scale tests at Polysi"s in Ger'any. &a'ples 7ro' t?e &G& 4ake7ield tests 2ere sent to McClelland 4aboratories in t?e &A 7or col"'n leac? testing. Early indications are t?at t?e s"lp?ide ores s?o2 a ?ig?er gold recovery t?an e8"ivalent cone cr"s?ed 'aterial 2?ile o>ide ores s?o2 little di77erence. T?e Polysi"s test2ork provided in7or'ation 7or t?e si@ing and design o7 an ind"strial PG* circ"it. Cr"s?ed sa'ples ?ave also been sent to McClelland 4aboratories 7or col"'n leac? testing. *es"lts are e>pected in +ove'ber-ece'ber #$!$. A si'"lated ind"strial scale PG* prod"ct si@e distrib"tion c"rve 7or 4obo s"lp?ide ore is s?o2n in ;ig"re #.!. F$4."! 2-15 HPGR S$.&#! P"%. S$8! D$"$9.$%n
*eport
Pgina 11 de #!
O!"#$n4 C% A s"''ary o7 t?e di77erence in operating costs bet2een t?e P;& pdate case and t?e PG* case is s?o2n in Table #=!. T?is s?o2s t?at t?e PG* operating costs are ?ig?er by &F $./t d"e to ?ig?er po2er and 2ear parts costs. T#9&! 2-15 P"%! O!"#$n4 C% 9, C% T,! HPGR
PFS C%
T"#! %//
C% D$/*
'.9%#& US:;)
'.9%#& US:;)
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Energy 5ear parts Maintenance 4abo"r
$.!1 $.$/3 $.$3 $.$/9
$.1#9 $.!9 $.$3 $.$/9
$.#!# $.!#1 $ $
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C#$#& C% A s"''ary o7 t?e di77erence in capital costs bet2een t?e P;& pdate case and t?e PG* case is s?o2n in Table #=#. PG* costs are ?ig?er by &F !3 'illion d"e to ?ig?er civil concrete arc?itect"ral electrical and indirect costs. T#9&! 2-25 C#!@ C%#"$%n 9, D$$&$n! D$$&$n! Mining Eart?2orks Civil Concrete &tr"ct"ral Arc?itect"ral E8"ip'ent Mec?anical Piping Electrical Instr"'entation
T%#& D$"! C% Total Indirect Cost
C%n$n4!n, In$$#& C#$#& C%
*eport
HPGR T%#& 'US: $&&$%n)
PFSU T%#& 'US: $&&$%n)
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F$n#n$#& An#&,$ T?e analysis 2as carried o"t "sing t?e P;& pdate 7inancial 'odel 2it? t?e PG* data. In t?e absence o7 leac? recovery data t?e s"lp?ide ore gold recoveries 2ere varied to deter'ine t?e breakeven point (i.e. sa'e +PV) co'pared to t?e P;& pdate. ;ro' Table #= it can be seen t?at t?is point occ"rs at a s"lp?ide ore recovery increase o7 !.3 at a 1 disco"nt rate. A 1 recovery increase provides an additional &F 9: 'illion in +PV. T#9&! 2->5 F$n#n$#& An#&,$ R!.& C#!
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&F$$$
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&F$$$ &F$$$ &F$$$
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(!) P;& recoveries (#)P;& recoveries H !.3 ()P;& recoveries H (/)P;& recoveries H 1 (1)P;& recoveries H 9
Table #=/ provides a s"''ary o7 t?e 7inancial 'odel inp"ts cas? costs and +PV. A 1 increase in s"lp?ide ore recovery prod"ces an additional #11$$$ o@ o7 gold and red"ces cas? costs by &F !:o@.
*eport
Pgina 99 de #!
T#9&! 2-<5 P"%.$%n #n F$n#n$#& S.#",
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Gold payable Copper payable Total cas? costs Copper credit Cas? costs net o7 credits (C! +et -irect Cas? Cost) C"'"lative net cas? 7lo2 Internal rate o7 ret"rn
N! "!!n +#&.! Mine li7e Payback period Total initial capital (inc.pre= stripping) Total s"staining capital ( e>c.clos"re cost )
T%#& LOM #$#& '$n$$#& #n .#$n$n4) +otes
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Fo@ FM :M 0ears 0ears
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(!) P;& recoveries (#)P;& recoveries H !.3 ()P;& recoveries H (/)P;& recoveries H 1 (1)P;& recoveries H 9
CIRCUIT DESCRIPTION AND DESIGN CRITERIA C$".$ !"$$%n A si'pli7ied 7lo2s?eet is s?o2n in ;ig"re .!
*eport
Pgina 33 de #!
F$4."! >-15 S$&$/$! F&%(!!
T?e pri'ary cr"s?ing and coarse ore stockpile are identical to t?e P;& pdate design. Polysi"s stated a design criterion 7or t?e PG* 7eed si@e as !$$ passing /$ ''. T?e secondary cr"s?ing circ"it is t?ere7ore a closed circ"it. Material disc?arged 7ro' t?e coarse ore stock pile is conveyed to t2o $$ t capacity secondary cr"s?er 7eed bins. T?e bins are disc?arged by vibrating 7eeders to t2o .$ ' 2ide by 9. ' long do"ble deck banana screens (one per line). T?e screen oversi@e 7eeds t2o MP !#1$ standard cone cr"s?ers eac? 7itted 2it? a !#1$ ?p (<$k5) 'otor 2?ile t?e screen "ndersi@e passes to t?e PG* 7eed stockpile. T?e cr"s?er disc?arge is re=circ"lated via t2o conveyors to t?e cr"s?er 7eed bins. T?e PG* 7eed stockpile ?as $$ tonnes live capacity and is covered. T?e ore is disc?arged by si> vibrating 7eeders arranged in t2o lines o7 t?ree 7eeders. Eac? line disc?arges to a separate conveyor one conveyor per PG* cr"s?er. T?e PG* circ"it consists o7 t2o Polysi"s 'odel #$ > !9 cr"s?ers eac? 7itted 2it? t2o variable speed !<1$ k5 'otors. T?e 7eed conveyors disc?arge into 7eed c?"tes designed to provide an even pl"g 7lo2 to t?e cr"s?ers. Cr"s?ed 'aterial 7ro' eac? PG* passes onto a vibrating pan 7eeder to break "p any cake 7or'ation and t?en to a *eport
Pgina << de #!
.: ' 2ide > 3.1 ' long banana screen. &creen "ndersi@e 2it? a P <1 !$ '' is conveyed to agglo'eration 2?ile t?e oversi@e is ret"rned to t?e PG* 7eed stockpile. T?e 7lo2s?eet can be 7o"nd in Appendi> I d2g. A! #!9:=$1$!=$!=$$!.
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D!$4n C"$!"$# T?e design criteria are s?o2n in Appendi> II doc"'ent #!9:=$!=-C=$$!. T?e basic data 7or ore c?aracteristics and plant t?ro"g?p"t are identical to t?e design criteria 7or t?e P;& pdate report.
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PLANT LAYOUT T?e plant layo"t can be 7o"nd in Appendi> II d2g. A! #!9:P=$1$!=1$=$9$=$. T?e layo"t ?as been developed considering design in7or'ation 7ro' Polysi"s and revie2s by 6en %oyd AMECBs senior cr"s?ing and 'aterials ?andling cons"ltant. T?e plant ?as been laid o"t as t?ree 'ain ele'ents eac? connected by conveyors. T?ese are
S!%n#", ".($n4 T?e b"ilding is an enclosed steel str"ct"re /.1 ' long > !:.$ ' 2ide > < ' ?ig?. It is e8"ipped 2it? a 1 t capacity bridge crane and laydo2n space is provided to 7acilitate 'aintenance.
HPGR /!! %3$&! T?e stockpile is covered by a pre=7abricated steel do'e to contain d"st and is / ' in dia'eter and !< ' ?ig?. Eac? line o7 7eeders and t?e corresponding conveyors are ?o"sed in concrete t"nnels # ' long. T?e conveyors e>it to grade level via corr"gated steel '"lti=plate t"nnels. A stockpile 2as selected instead o7 steel silos to provide a greater storage vol"'e at '"c? lo2er cost.
HPGR ".($n4 T?e b"ilding is an enclosed steel str"ct"re 1 ' long > #9 ' 2ide and /: ' ?ig?. It is e8"ipped 2it? a !$$ t capacity bridge crane and laydo2n area to 7acilitate c?anging o7 t?e grinding rolls.
*eport
Pgina !$!$ de
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TESTOR HPGR !$n4 # SGS L#3!/$!& PG* cr"s?ing test2ork 2as carried o"t at laboratory scale by &G& 4ake7ield ,ntario Canada and s"bse8"ently at larger scale at Polysi"s in Ger'any. A description o7 t?e tests and t?e res"lts 7ollo2s. T?e sa'ples received by &G& 4ake7ield consisted o7 #! individ"al intervals 7ro' t?e 7irst t2o ?oles ($# and $:) drilled 7ro' t?e 4obo deposit (4%-) and 2eig?ed appro>i'ately ! t. Eac? interval 2as identi7ied by a ticket n"'ber a drill?ole n"'ber dept? alteration type and 8"alitative gold grade (?ig? or lo2). T?e sa'ples represented a total o7 eig?t categories (t2o alteration types t2o grades and t2o drill?oles) 2?ic? are s"''ari@ed in Table 1=!. Category co'posites 2ere prepared and cr"s?ed to no'inal !#.9'' and a 1$ kg s"b=sa'ple 2as prepared. T?e eig?t 1$ kg s"b=sa'ples 2ere co'posited into an ,J co'posite (4%-=$# ,J=4G ,J=G and 4%-=$: ,J=4G ,J=G) and an &J co'posite (4%-=$# &J=4G &J=G and 4%-=$: &J=4G &J=G). T#9&! -15 S#&! D!"$$%n S#&! C#!4%" $!
R!!$+!
!$4( 34
S%"!
A&!"#$%n
C%%$!
4%-=$# ,J 4G
!1<
1$
,J Co'
!$<
4%-=$# ,J G
3#
1$
,J Co'
#
4%-=$# &J 4G
!$
1$
&J Co'
3$
4%-=$# &J G
!1!
1$
&J Co'
!$!
4%-=$: ,J 4G
9
1$
,J Co'
#
4%-=$: ,J G
!!
1$
,J Co'
3!
4%-=$: &J 4G
!9
1$
&J Co'
39
4%-=$: &J G
!#/
1$
&J Co'
9/
A ?ead sa'ple 2as taken 7ro' t?e t2o co'posites 7or speci7ic gravity (&G) b"lk density particle si@e analysis (P&A) and Kas receivedB 'oist"re deter'ination. T?e &G 2as 'eas"red "sing a gas pycno'eter. T?e b"lk density 2as 'eas"red by vibrating t?e sa'ple 7or 7ive 'in"tes in a ! 4 grad"ated cylinder and recording t?e vol"'e. T?e *eport
Pgina !!!! de
7eed c?aracteristics o7 t?e t2o stage=cr"s?ed co'posites (at !#.9 '') are s"''ari@ed in Table 1.=#. T#9&! -25 F!! C(#"#!"$$ O C%
F!! C(#"#!"$$
S
C%
;1$ ('icrons)
/199
13:#
;3$ ('icrons)
3!$!
3
!$.!
:.<
Percent Passing : 'es?
/!.1
#.#
&peci7ic Gravity (kg4)
#.:!
#.:/
5et %"lk density (kg4)
!.1<
!.11
Moist"re as received ( #$)
$.$
$.$
Percent 'es?
Passing
!$$
Prior to cr"s?ing t?e 'oist"re content 2as adD"sted to # as re8"ested by 6inross by adding 2ater to t?e 7o"r <$ kg sa'ples (,J PG* &J PG* ,J Cone and &J Cone) and 'i>ing in a ce'ent 'i>er. T?e t2o <$ kg PG* sa'ples 2ere processed separately t?ro"g? t?e 4ab2al "nit in # one pass. A speci7ic grinding 7orce o7 +'' 2as "sed. T?e sa'ple 2as c?oke 7ed to t?e PG* "nit and t?e test d"ration 2as recorded 2it? a stop2atc?. T?e po2er dra2 and operating press"re 2ere recorded. -"ring testing 7lakes 7ro' t?e PG* prod"ct 2ere collected and t?e 7lake t?ickness 2as 'eas"red 2it? a r"ler and recorded. &o'e 2a>=coated 7lakes 2ere s"b'itted 7or b"lk density deter'ination (t?e 2a> protects t?e sa'ple 7ro' breaking "p 2?en i''ersed in 2ater and prevents t?e 2ater 7ro' 7illing t?e voids in t?e 7lake). T?e 7lake speci'ens 2ere 2eig?ed be7ore and a7ter coating 2it? 2a> prior to &G deter'ination "sing displace'ent tec?ni8"e. T?e 2eig?t and vol"'e o7 t?e 2a> 2ere kno2n ?ence t?e act"al b"lk density o7 t?e 7lakes co"ld be calc"lated. T?e PG* and cone cr"s?er prod"cts 2ere blended and s"b=sa'pled 7or P&A. T?e 7eed and prod"ct P&As are presented in ;ig"re 1=!. T?e t?ick lines represent t?e 7eed t?e solid t?in lines represent t?e cone cr"s?er prod"ct and t?e dotted lines represent t?e PG* prod"ct. It can be seen t?at t?e PG* prod"cts 2ere signi7icantly 7iner t?an t?e cone cr"s?er prod"cts as e>pected. T?e 7"ll report is presented in Appendi> III. *eport
Pgina !#!# de
F$4."! -15 C".($n4 T!%"3 R!.&
*2
HPGR T!$n4 # P%&,$. In May #$!$ 'aterial 2as s?ipped to Polysi"s Ger'any to r"n PG* test2ork. T?e sa'ples selected 7or PG* test2ork 2ere c?osen by p?ysical c?aracteristics according to t?e 'ine prod"ction plan (see Appendi> III 7or 7"rt?er in7or'ation). T?e test2ork 2as carried o"t in L"ly #$!$. T?e ?ig? press"re grinding test2ork on a se'i=ind"strial scale provided t?e basis 7or t?e 7ollo2ing •
&i@ing o7 t?e 7"ll scale ind"strial PG*s to 'atc? t?e t?ro"g?p"t re8"ire'ents
•
-eter'ination o7 t?e opti'"' grinding 7orce to ac?ieve a certain prod"ct 7ineness
•
-eter'ination o7 t?e absorbed energy at t?e re8"ired grinding 7orce
•
•
&i'"lation o7 ind"strial prod"ct si@e distrib"tions ac?ievable on 7"ll scale ind"strial PG*s &i'"lation o7 t?e circ"lating load and prod"ct 7ineness in ind"strial closed circ"it.
Additional 2ear testing on t?e AT5A4 abrasion testing "nit allo2ed proDection o7 t?e 2ear li7e to be e>pected 7or ind"strial 2ear protection tyres. T?e test progra' at Polysi"s is s"''ari@ed in ;ig"re 1.=#.
*eport
Pgina !! de
F$4."! -25 P%&,$. T! P"%4"# S.#",
;o"r sa'ples 7or col"'n leac? tests at McClelland 4aboratories 2ere selected to co'pare conventional cone cr"s?ing vers"s PG* cr"s?ing. T?e particle si@e distrib"tions o7 t?e PG* test prod"cts are s?o2n in ;ig"re 1= and ;ig"re 1=/.
*eport
Pgina !/!/ de
F$4."! ->5 HPGR F!! #n T%#& P"%. S$8! D$"$9.$%n
F$4."! -<5 HPGR F!! #n C!n"! P"%. S$8! D$"$9.$%n
T?e ind"strial prod"ct si@e distrib"tion 2ill di77er 7ro' t?at obtained in t?e se'i= ind"strial tests. T?e edge e77ect 2ill be less prono"nced in an ind"strial 'ac?ine since t?ese "nits ?ave a ?ig?er 4- ratio t?an t?e test "nit. T?e red"ced edge e77ect s?o"ld increase t?e prod"ct 7ineness. o2ever t?e ind"strial PG* 2ill "s"ally be 7ed 2it? a coarser 7eed si@e and 2ill be operated 2it? a larger 2orking gap allo2ing so'e larger
*eport
Pgina !1!1 de
particles to pass t?e gap "n=cr"s?ed. T?ese e77ects 2ill "s"ally lead to a coarser ind"strial PG* disc?argeN co'pared to t?e prod"cts generated in t?e test2ork. &i'"lation 2as carried o"t to predict t?e e>pected ind"strial si@e distrib"ti on o7 t?e PG* disc?arge and o7 t?e screen "ndersi@e prod"ct 7or a closed circ"it operation. T?ese si'"lations took into acco"nt t?e ind"strial 7eed gap si@e applied grinding press"re and t?e operating 'ode (single pass 'ode edgecake recirc"lation or closed circ"it operation). &i'"lation also allo2ed t?e deter'ination o7 circ"lating loads 7or ind"strial PG* operation in closed circ"it 2it? screens. T?e si'"lated PG* prod"ct si@e distrib"tion is s?o2n in ;ig"re 1=1. T?is distrib"tion ass"'es an PG* 7eed si@e o7 !$$ passing /$ '' 2it? t?e cr"s?ers operating in closed circ"it 2it? screens. It can be seen t?at t?e prod"ct P 3$ is : '' and t?e P<1 is !$ ''. T?ere is a concern t?at t?e percent passing 9/ 'icrons (#$$O) at !/ is ?ig? 7or ?eap leac?ing in '"ltiple li7ts. Per'eability vers"s load tests are being carried o"t at AMECBs laboratory in *eno +evada. F$4."! -5 HPGR S$.&#! P"%. S$8! D$"$9.$%n
*eport
Pgina !:!: de
*>
P%&,$. E.$!n R!%!n#$%n Polysi"s reco''ended t2o 'odel #$ > !9 cr"s?ers eac? e8"ipped 2it? # > !<#1 k5 variable speed 'otors. T?e rolls are # ' dia'eter > !.:1 ' long 2it? a design perip?eral speed o7 #.$ 's. T?e esti'ated tyre li7e at t?e design speed is :#1$ ?o"rs. T?e preli'inary report can be 7o"nd in Appendi> III.
6*0
OPERATING COSTS T?e PG* operating costs 2ere calc"lated 7ro' po2er and 2ear costs provided by Polysi"s. T?e costs 7or t?e balance o7 t?e 7ine cr"s?ing circ"it 2ere based on AMEC and ot?er 'an"7act"rerBs data. Table :=! s?o2s costs by cost type 2it? a co'parison to t?e e8"ivalent P;& pdate costs 7or t?e 7ine cr"s?ing area. Costs 7or ot?er areas did not c?ange. T#9&! 6-15 P"%! O!"#$n4 C% 9, C% T,!
'.9%#& US:;)
HPGR T"#! %// '.9%#& US:;)
Energy 5ear parts Maintenance 4abo"r
$.!1 $.$/3 $.$3 $.$/9
$.1#9 $.!9 $.$3 $.$/9
$.#!# $.!#1 $ $
T%#&
0*<=>
0*?>0
0*>>7
F$n! C".($n4
PFS C%
C% D$/* 'US:;)
It can be seen t?at t?e operating cost increase 7or t?e PG* circ"it is &F $.9t 2it? : attrib"table to ?ig?er po2er costs and t?e balance 2ear parts costs.
7*0
CAPITAL COSTS Mec?anical and electrical e8"ip'ent lists 2ere prepared 7or t?e 7ine cr"s?ing area and civilstr"ct"ralarc?itect"ral 8"antity take=o77s 2ere 'ade 7ro' t?e layo"t dra2ing. +o c?anges 2ere 'ade to ot?er plant areas. Table 9=! s?o2s t?e costs by discipline co'pared to t?e e8"ivalent costs 7or t?e P;& "pdate. Table 9=# s?o2s t?e costs by area incl"ding t?e indirect cost distrib"tion.
*eport
Pgina !9!9 de
T#9&! 7-15 C#!@ C%#"$%n 9, D$$&$n! D$$&$n! Mining Eart?2orks Civil Concrete &tr"ct"ral Arc?itect"ral E8"ip'ent Mec?anical Piping Electrical Instr"'entation
T%#& D$"! C% Total Indirect Cost
C%n$n4!n, In$$#& C#$#& C%
HPGR T%#& 'US: $&&$%n)
PFSU T%#& 'US: $&&$%n)
!#/ < // ## ## !< !3 < !# <60 1
!#/ < 3 #$ #! !< !3 9 !# <
711
6=>
T#9&! 7-25 C#!@ C%#"$%n 9, A"!# F#$&$, Mine E8"ip'ent &ite -evelop'ent Mine -evelop'ent Process ;acilities eap 4eac?ing Tailings I'po"nd'ent
T%#& D$"! C% Indirect Constr"ction Costs Engineering Proc"re'ent ProDect Manage'ent Costs 5are?o"se Inventory ;reig?t -"ty And Ta>es
T%#& In$"! C% C%n$n4!n, In$$#& C#$#& C%
HPGR T%#& 'US: $&&$%n)
PFSU T%#& 'US: $&&$%n)
<$ !$1 1 #!< !$ <60 # 1 < !! ! 1
<$ !$/ 1 #$< !$ <
711
6=>
It can be seen t?at t?e total 'ec?anical e8"ip'ent cost 7or PG* is si'ilar to t?e P;& pdate case. o2ever civil concrete str"ct"ral arc?itect"ral and electrical costs are ?ig?er. T?e ?ig?er direct cost i'pacts indirect costs and contingency. T?e detailed capital cost esti'ate can be 7o"nd in Appendi> IV.
*eport
Pgina !3!3 de
?*0
FINANCIAL ANALYSIS -isco"nted cas? 7lo2 analysis 2as carried o"t "sing t?e P;& pdate 7inancial 'odel 2it? t?e PG* capital and operating costs. An analysis 2as carried o"t to deter'ine t?e increase in gold recovery t?at 2o"ld be re8"ired 7or t?e PG* option to ac?ieve t?e sa'e +et Present Val"e (+PV) as t?e P;& pdate. Preli'inary col"'n leac? tests indicate t?at PG* cr"s?ed s"lp?ide 'aterial 'ay ?ave a ?ig?er gold recovery t?an e8"ivalent cone cr"s?ed 'aterial. +o di77erence ?as been seen 7or o>ide ore. T?ere7ore t?e s"lp?ide recoveries 2ere increased in incre'ents to deter'ine t?e breakeven recovery 2it? t?e P;& pdate case and to s?o2 t?e "pside potential. ;ro' Table 3=! it can be seen t?at t?e breakeven point is an increase in s"lp?ide recovery o7 !.3 i.e. 7ro' 1$.< to 1#.9 7or 4obo lo2 grade s"lp?ides :$.! to :!.< 7or 4obo ?ig? grade s"lp?ides :.: to :1./ 7or Marte lo2 grade s"lp?ides and 9$.1 to 9#. 7or Marte ?ig? grade s"lp?ides. +o increases 2ere 'ade to o>ide recoveries. An increase o7 1 in t?e s"lp?ide recovery increases t?e +PV by &F 9: 'illion co'pared to t?e P;& pdate case at a 1 disco"nt rate. A 9 recovery increase gives an additional &F !# 'illion. T#9&! ?-15 F$n#n$#& An#&,$ R!.& C#!
P;&
(!)
(#)
()
(/)
PG*
PG*
PG*
PG*
(1)
PG*
C..&#$+! n! #( /&% ndisco"nted
&F$$$
313913
3$#:93
39$/$$
<<$$3/
!$:1!
-isco"nted at 1 -isco"nted at 3 -isco"nted at !$ -isco"nted at !#
&F$$$ &F$$$ &F$$$ &F$$$
#19<1 !<#9 /<<#3 =!39!/
#3#3/ !$#!:# !:!:! =/<13$
#1<#/ !1:19 //:3< =#1!/:
1///1 !193!$ :1/3 =<$$!
/$!931 !
//<#$< #!#: !#1<:9 //:<
Internal rate o7 ret"rn
!!./
!$./
!!.#
!!.9
!#.1
!.
9.
9.:
9./
9.#
9.$
:.9
N! "!!n +#&.!
Payback period +otes
*eport
0ears
(!) P;& recoveries (#)P;& recoveries H !.3 ()P;& recoveries H (/)P;& recoveries H 1 (1)P;& recoveries H 9
Pgina !
T#9&! ?-25 C#( C% !". G%& "!%+!", C#! C% !" %nn! $&&! 'US:;)
P;&
PG*
(!)
PG*
(#)
()
PG*
PG*
(/)
(1)
PG*
Mining
1.$#
1.$#
1.$#
1.$#
1.$#
1.$#
Process GA &'elter costs TC*C Price participation Concentrate transport
/.<# !.#$
1.#: !.#$
1.#: !.#$
1.#: !.#$
1.#: !.#$
1.#: !.#$
$.$ $.$3
$.$ $.$3
$.$ $.$3
$.$ $.$3
$.! $.$<
$.! $.$<
!!.1#
!!.31
!!.3:
!!.3:
!!.39
!!.39
(!.##)
(!.##)
(!.##)
(!.##)
(!.##)
(!.##)
(!.##)
(!.##)
(!.##)
(!.##)
(!.##)
(!.##)
!$.$
!$.:/
!$.:/
!$.:1
!$.:1
!$.::
#!1.99 #!!.:
#!1.99 ##1.3:
#!$.: ##$.!<
#$:.<$ #!:.19
#$!.3 #!$.9<
!<:.!1 #$1.!
1!.1$
1!.1$
1$.#$
/<.3
/3.$:
/:.3!
!#.91 ./3 /
!#.91 ./3 1$<.:
!#.:$ ./: /<:.3#
!#.1$ ./1 /33.3$
!#./ ./ /9:.$$
!#.!< ./! /:.33
(1#.##) (1#.##)
(1#.##) (1#.##)
(1$.
(1$.$9) (1$.$9)
(/3.9) (/3.9)
(/9./9) (/9./9)
//#.:/
/19.!/
//1.
/3.9
/#9.#9
/!:./!
&"b=total Credits Copper &"b=total AdD"sted cas? costs Total
C% !" %.n! A. #,#9&! 'US: ;%8) Mining Process GA &'elter costs TC*C Price participation Concentrate transport &"b=total Credits Copper &"b=total AdD"sted cas? costs Total +otes
(!) P;& recoveries (#)P;& recoveries H !.3 ()P;& recoveries H (/)P;& recoveries H 1 (1)P;& recoveries H 9
;ro' t?e above it can be seen t?at an increase o7 1 in s"lp?ide gold recovery red"ces costs by &F !1o@
*eport
Pgina #$#$ de
T#9&! ?->5 P"%.$%n D## C#!
(!)
P;&
(#)
PG*
PG*
PG*
()
(/)
PG*
PG*
(1)
Total Mined Total 5aste Total ,re
(kt) (kt) (kt)
/:<: #3/!$# !1##
/:<: #3/!$# !1##
/:<: #3/!$# !1##
/:<: #3/!$# !1##
/:<: #3/!$# !1##
/:<: #3/!$# !1##
A" CnC" *ecovery A" *ecovery CnC"
(gt) () () ()
!.!:< $.$: :#.#! :3.:$
!.!:< $.$: :#.#! :3.:$
!.!:< $.$: :.3! :3.:$
!.!:< $.$: :/.33 :3.:$
!.!:< $.$: ::.:: :3.:$
!.!:< $.$: :3.// :3.:$
Gold contained Copper contained
(o@) 19#1!<# 19#1!<# (lb) !#$$:/::: !#$$:/:::
Gold recoverable
(o@)
1:!:!3
1:!:!3
:1#9!
9!/9
3!:#!$
Copper recoverable (lb)
3#:/:!
3#:/:!
3#:/:!
3#:/:!
3#:/:!
3#:/:!
+otes
19#1!<# !#$$:/:::
19#1!<# 19#1!<# 19#1!<# !#$$:/::: !#$$:/::: !#$$:/:::
(!) P;& recoveries (#)P;& recoveries H !.3 ()P;& recoveries H (/)P;& recoveries H 1 (1)P;& recoveries H 9
It can be seen t?at an increase o7 1 in s"lp?ide gold recovery give an additional #11$$$ o@ o7 gold prod"ction. T#9&! ?-<5 P"%.$%n #n F$n#n$#& S.#",
S., Gold payable Copper payable Total cas? costs Copper credit Cas? costs net o7 credits (C! +et -irect Cas? Cost) C"'"lative net cas? 7lo2 Internal rate o7 ret"rn
N! "!!n +#&.! Mine li7e Payback period Total initial capital (inc.pre= stripping) Total s"staining capital ( e>c.clos"re cost )
T%#& LOM #$#& '$n$$#& #n .#$n$n4) +otes
*eport
(!
P;& 6o@ 6lb Fo@ Fo@
PG* )
1// 1// 9<:# 9<:# /<1 1$< =1# =1#
(#)
PG*
()
PG*
(/)
PG*
(1)
PG*
:1 9<:# /<9 =1!
:<: 9<:# /3< =1$
9<9 9<:# /9: =/<
3<3 9<:# /:/ =/9
/19 3$ !$./
//: 39$ !!.#
/<
/#9 <<$ !#.1
/!: !$:1 !.
>2*?
2?2*?
>2*=
><*<
<01*?
<<=*2
Fo@ FM :M 0ears 0ears
// 31< !!./
<.< 9.
<.< 9.:
<.< 9./
<.< 9.#
<.< 9.$
<.< :.9
FM
:<#.9
9!!./
9!!./
9!!./
9!!./
9!!./
FM
3#.3
3#.3
3#.3
3#.3
3#.3
3#.3
:M
77*
7=<*2
7=<*2
7=<*2
7=<*2
7=<*2
(!) P;& recoveries (#)P;& recoveries H !.3 ()P;& recoveries H (/)P;& recoveries H 1 (1)P;& recoveries H 9 Pgina #!#! de
