Kriging in GEMCOM for WindowsGeneral notes

Topics coveredIntroductionData preparationKriging profile editorA basic runSome advanced topics

IntroductionGood basic Kriging / ID modeling packageID modelsOK, IK, MIKflexible rock types, searchexcellent trace capabilitiesCross validation / Jack KnifingSimilar to Dos GEMKRIGE

New in Windows versionBuilt in Batch mode runsDisplay in 2D or 3DInteractive trace blocksDirect viewing of resultsRemoval of number of sample limitsMuch improved use of Selection for target blocksDirect access to Cross validationOther minor enhancements

Data preparationMust have :Extraction data files (load in view in G4W)Variography resultsRock type modelPre-initialized block model(s)GradeSpecial modelsPercentage ore models (for IK)

Sample data

Load and display rock type model

Use Cell edit to double check rocks

Special model(s) (Pre-initialized)

Edit the Kriging profile

Double check output block models

Be sure to use some trace blocks!If using Cross validation, ensure there is an ASCII output file

Now ready for an actual runSelect Kriging profileSelect additional trace blocks (if required)Set up batch mode run (if required)Select view positionFor trace only run, do not refresh screen on each benchGO !

For a first run, or for anisotropy, use test blocks featureCheck the Redraw for new levels tick-box

Check Anisotropy ellipsoids (2D)

Check Anisotropy ellipsoids (3D)

Check Text results also !

Do a full run - then check trace blocksNote blocks being Kriged

View trace infoClick hereDetail here

View results summariesCheck cross validation (See Also ASCII output)Check totals done

Cross Validation Ascii output :

Finally : Display the resulting grades

Also see Special value resultsNumber of Octants

Advanced TopicsHigh grade search radiiMaximum samples per holeUp to 8 variogram components per modelAllows sophisticated zonal and geometric anisotropyMIK optionsSingle or multiple variograms (indicator type)Mean or median or high grade binDetailed trace blocks - shows processInterface to GSLIB or other geostatsUse new powerful export / import of block models