数字化矿山技术.pptx

MineralResourceStatementforaTaconiteIronDepositConsideringDynamicAnisotropyFilipeS.Beretta,MiningEngineerMSc.MarkCampodonic,Jean-FranoisCouture,DominicChartier,Introduction,Introduction,Introduction,Twooptions:unfoldingordynamicanisotropy,DynamicAnisotropy,Thewireframesanglesareinterpolated;Assignedasanewvariabletoeachblock;Usedastheorientationforthesearchellipsoid.,DynamicAnisotropy,Casestudy,CenturyIronMinesCorporation(theClient):HayotLake(AttikamagenIronOreProperty)RainyLake(SunnyLakeIronOreProperty)JoyceLake(AttikamagenIronOreProperty),Casestudy,Resourcedatabase,RawstatisticsforFe,SiO2,Al2O3,P2O5,MnOandLOIsupportedtheselectionofthedomains.,124boreholes-23000m;5,000samples;Roughly500 x400mspacing;,Methodology,Databasevalidation;Geologicinterpretationandmodelling;Classicstatisticsandgeostatistics;Gradeestimationbyordinarykrigingwithdynamicanisotropy;Subsequentdatavalidation;andReportingaboveoptimisedpitshell.,Geologicalinterpretationandmodelling,Geologicalinterpretationandmodelling,Variography,VariogramParameters,SearchNeighbourhood,ParametersdefinedthroughQKNA,SearchVolume1=FeVariographyRangesMinimumof6samples;Maximumof25samples;Maximumof4samplesperdrillhole;,SearchVolume2=SV1Rangesx2Minimumof6samples;Maximumof25samples;Maximumof4samplesperdrillhole;,SearchVolume3=SV1Rangesx100Minimumof1sample;Maximumof25samples;Maximumof4samplesperdrillhole;,Estimationparameters,SummaryofBlocksEstimatedDuringEachEstimationPass,OrdinaryKriging;DynamicAnisotropytofitthevalueswiththegeologicalmodel;150azimuthrotatedblockmodelin(100 x100 x10m);Hardboundariesbetweensub-domains;,Validation,Visualcheck-GradeestimationandDynamicAnisotropyTechnique,Validation,MeangradescomparisonbetweenblocksandsamplesGLOBALVALIDATION,Validation,Fevalidationplots,Mineralresourcesclassification,AppliedMeasuredMineralResource:Nonreported;IndicatedMineralResource:Drillholesspacingat400by500metresorless.Blocksestimatedduringthefirstestimationrunwithaslopeofregressiongreaterthanorequalto0.6;InferredMineralResource:Blockswereestimatedusingatleast2drillholesandarelocatednotfartherthan500metresfromthelastdrillholeinalldirectionsandtoadepthnotexceeding250metresfromthebottomofthedrillholes;andUncategorized:Allremainingblocksinthemodel.,Mineralresourcesclassification,MineralresourcesclassificationOptimisation,Mineralresourcestatement,16Gt!,Conclusions,DynamicAnisotropyallowedarobustestimationandvalidationinashorterperiodoftimewhencomparedwiththeunfoldingtechnique.Consideringthegentlefolding,thevisualandstatisticalvalidationwereperformedwithagoodconfidence.Formoreseverelyfoldeddepositsand/orlargerdrillingspacing,theunfoldingprocessshouldbeusedinstead.,Conclusions,Theconfidenceingeologicalcontinuityoftheironmineralizationisconsideredasgood.Therefore,onthebasisofgeologicalcontinuityalone,IndicatedorInferredcategoriescanbereportedatthepresentdrillingspacing(400by500metres).Theconfidenceinthegeologicalcontinuitydeterioratesnearthecrossfaultandnearthemodelboundaries.Onthisbasis,moreinformationisrequiredontheseareastoprovideabetterdegreeofconfidence.Drillspacingof200by250metresisrequiredtodemonstrategeologicalandgradecontinuity,andtoimprovethevariogrammodels.Herewith,theclassificationcouldbeimprovedandMeasuredclasscouldbereported.