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1、BreathoffreshairWithnoaspectofundergroundminesafetymorefundamentalthanproperventilation,variousmodernsystemsarebeingusedtoensureairflowissafeforworkersBYBREEFREEMANWhenitcomestoundergroundmineworkings,fewthingsaremoreimportantthanadequateventilation.Everyyearenormouseffortsaremadetomain
2、tainandimproveairflowtoworkingareas.Thisistodiluteemissionsbelowstatutorylimits,rendertheairharmless,carryawayhazardouscontaminantsandprovidenecessarylevelsofoxygenfortheminers.Asaresult,ventilationsystemsformacrucialpanofthedesignofanymine,thelayoutofwhichisdeterminedbytheorebodygeolog
3、y,legislation,availablemanpower,miningmethodsandtheequipmentused.Specificenvironmentalissuessuchasvirginrocktemperatures,spontaneouscombustionanddustcontrolfurthercomplicatetheoreticalventilationsystems.Moreover,whateversystemiseventuallyplannedwillinevitablysufferfromimperfectimplement
4、ationandcontrolbecauseoftheday-to-daycomplexitiesoftheextractionoperation.“Ventilationinthemodemmineisanessentialprerequisite,perhapsevenmoresothaninthepast.Apartfromtheobviousbiologicalaspectofpreventingdepletionofoxygenandthebuild-upofcarbondioxideintheair,themine-ventilationsystemmus
5、tbeabletokeepquantitiesofcontaminantsbelowharmfullevels,”saysMikeBeare,principalminingengineerforconsultancySRK.Heexplains:“Amodernminehasmanysourcesofharmfulsubstances,includingfumesfromexplosives,dustfrombrokenrockandgasespresentintherocksthemselves.inadditiontothese,themodemapproacht
6、omining(includingtheuseofdiesel-enginetrucksandloaders)resultsinlargequantitiesofCO,nitrousfumesanddiesel-particulatematterenteringthemineairflow.Whilescrubbersarefitted,theydonotremoveallthecontaminantsandtheventilationsystemhastobedesignedtobeabletodilutethesetosafelevels.”Theseissues
7、demonstratetheneedforexpertdesign,observesSRK,whichalsosignalstheneedforventilationcoststobeminimisedinthesamewayasanyothercostaspectAsaresult,variousproductionscenariosneedtobeaddressedattheoutset.Centraltoallofthesecalculationsisthesimplefactthatairflowisdeterminedbytemperatu
