Click here to load reader

in Cyanide Code the New Gold Fields TSF · PDF fileIncorporating Best Practice in Cyanide Code Design and Operation at the New Gold Fields Mega TSF at South Deep. Andrè Smuts

  • View
    213

  • Download
    0

Embed Size (px)

Text of in Cyanide Code the New Gold Fields TSF · PDF fileIncorporating Best Practice in Cyanide Code...

  • IncorporatingBestPracticeinCyanideCode DesignandOperationattheNewGoldFields

    MegaTSFatSouthDeep.Andr

    Smuts

    September2012

  • Contents

    1.Locationandbackground

    2.Doornpoort

    TailingsStorageFacility

    3.Depositionmethod

    4.Cyanidecodeconsiderations

    5.Samplingandmonitoring

    6.Questions

    22

  • Locationandbackground

  • SouthDeepGoldMineDoornpoortTSF

  • 55

    Background

    GoldFieldsSouthAfricabecamesignatoriestothe InternationalCyanideManagement(ICMI)codein2005

    TheSouthDeepoperationhaditsfirstintroductionto thecodeGAPauditinFebruary2007

    SouthDeepachievedfullaccreditationDecember2008

    18MonthHealthCheck:August2010

    RecertificationAudit:October2011

    Recertified:February2012

  • DoornpoortTailingsStorageFacility

  • PlanstobuildanewTSFwasfinalizedin2005

    Constructionstartedin2009

    ThephaseoneoftheTSFcoverssome283hectaresand wascommissionedinApril2011andtheoldTSFswere

    decommissionedandputonacareandmaintenance program.

    ThephasetwowhichwillincreasethesizeoftheTSF withafurther120hectaresistocommencein2016

    77

    TSFconstruction

  • DoornpoortDuringConstruction

    88

  • Returnwaterdams

    99

  • Returnwaterdamscompleted

    1010

  • DoornpoortTailingsStorageFacility

    1111

  • Depositionmethod

  • 16April2011

    FirstdaysdepositonDoornpoort

    1313

    Startedwithcoveringthetoe drainswithcoursecyclone

    underflowmaterial

  • Spigotdepositionmethod

    1414

  • Insideretainingwall

    1515

  • CyanideCodeConsiderations

  • ICMICode

    Principle4

    Mostofthedesignwasbaseontherequirementsfrom Principle4oftheInternationalCyanideManagement

    InstituteCodedocuments

    1717

  • Tailingsdeliveryandreturnwaterpipeline

    1818

    Thewaterandslurrypipelinesareroutedtogetherin unlinedearthbunding

    Roadwaynexttopipelinetoalloweasyaccessfordaily inspectionandmaintenance

    Thesteelpipelinesissupportedonconcreteplinths,has anchorplinthsandexpansionloop

  • Bundedpipeline,expansionloop

    1919

  • Crossings

    2020

    Therearetworoadcrossingsandariver crossingacrosstheKariegaspruit

  • KariegasSpruitcrossing

    2121

  • Roadcrossings

    2222

  • Lining

    2323

    Thepipelineshavebeenspecifiedas350NBmild steelpipelineswitha8mmHDPEinnerlining.

    250mmpressurereleasevalve.

  • 8mmHDPEliningandpressurereleasevalve

    2424

  • Thetoedrainsareoffsetfromtheinsidetoelineofthe

    starterwall

    Themaindrainwhichrunsparalleltothestarterwall,

    180mfromtheoutertoelinealongthesidesofthe dam,towardsthecentreofthedam

    Cutoffdrain,whichrunswithinthestarterwall,below

    thecrest

    Allthreeofthedrainshaveseparateoutletpipesinto

    themanholes

    2525

    Theunderdrainagesystemisbasedonthreesetsofdrains:

    Underdrainagesystem

  • Theoutletpipesfromtheunderdrainsdischarge intoasewertypesysteminsteadofthe

    conventionalsolutiontrench

    Themanholeswhichformpartoftheunder drainagecollectionsystemareclosedoffwith

    grates(insteadofsolidlids)topreventthebuildup ofHCNwithinthemanholes

    2626

    Underdrainagesystem

  • Mainandtoedrains

    2727

  • Manholesandunderdrains

    2828

  • Underdrainagesystem(continue)

    2929

    Theunderdrainagecollectionsystemcanbedirected throughtheneutralisationplantintotheSilttrap

    Acutoffchannelaroundthetailingsdamthatdirects externalsurfacerunoffawayfromthetailingsand

    waterdams,andtocontainpossiblespillagescaused bypipebursts

    Astormwatercanalaroundtheperimeterofthe starterembankmentwhichacceptsthedecanted waterfromthecatchmentpaddocks

  • Stormwaterdrainandsilttrap

    3030

  • Returndams

    3131

    Capacity1.06millionkiloliters

    Linedwith2mmHDPE

    Groundwaterpumpingandleakdetectionmonitoring.

    DailychecksonPhandWADsampling

  • Returnwaterdamsandgroundwaterpumping

    3232

  • Samplingandmonitoring

  • Samplingandmonitoring

    3434

    Dailypipelinechecks

    Flowdifferentialchecks

    Firstaidkitsontheretainingwalls

    Mockdrillsforcyanideandsnakebites.

    Continuestrainingofpersonnel.

    Cellphonecommunication.

  • Samplingandflowmonitoringinstallations

    3535

  • Thankyou

  • Questions [email protected]

    mailto:[email protected]

    Slide Number 1Slide Number 2Slide Number 3Slide Number 4Slide Number 5Slide Number 6Slide Number 7Slide Number 8Slide Number 9Slide Number 10Slide Number 11Slide Number 12Slide Number 13Slide Number 14Slide Number 15Slide Number 16Slide Number 17Slide Number 18Slide Number 19Slide Number 20Slide Number 21Slide Number 22Slide Number 23Slide Number 24Slide Number 25Slide Number 26Slide Number 27Slide Number 28Slide Number 29Slide Number 30Slide Number 31Slide Number 32Slide Number 33Slide Number 34Slide Number 35Slide Number 36Slide Number 37

Search related