Designation:D7629/D7629M–10StandardPracticeforMinimumGeospatialDataforRepresentingCoalSpoilandRefuseFeatures1ThisstandardisissuedunderthefixeddesignationD7629/D7629M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedefinesasetofterms,procedures,anddataelementsrequiredtodevelopanationalspatialdatasetoffeaturesassociatedwithexcessspoilandrefusematerialsproducedbycoalminingoperations.Thesefeaturesincludeexcessspoilstructures,coalpreparationplants,andcoalrefusestructures.1.1.1ExcessSpoilStructures—arecreatedwhenthetotalspoilproducedduringminingexceedsthevolumeofmaterialthatcanbeutilizedforreclamation.Thisoccurrenceiscom-moninsteepslopeareas,wherethefinalgradeofreclaimedslopesislimitedbystabilityrequirements.Italsooccurswhereoverburdenvolumeissignificantlylargerthanthevolumeofminablecoal.Spoilalsoexhibitsanetincreaseinvolumeduetotheintroductionofvoidspacesinfragmentedrockwhenoverburdenisremovedtoexposeunderlyingcoalseams.Theproductionofexcessspoilrequiresthecreationofdisposalstructuresthatextendoutsidetheminedarea.Thesestructuresusuallytaketheformofout-of-pitspoilpiles,side-hillfills,orvalleyfills(SeeFig.1).1.1.2CoalPreparationPlants—arefacilitieswherecoalisseparatedfromnon-combustiblematerials,andpotentiallycrushed,resized,andblendedwithothergradesofcoal.Preparationplantsproducerefuseasabyproduct.1.1.3Refuse—isawastebyproductofcoalprocessing,generallycategorizedaseithercoarseorfine.Finecoalrefuseoftenishandledasaslurrycontainingablendofwater,finecoal,silt,sand,andclayparticles.1.1.4ImpoundingRefuseStructures—createaholdingareaforslurrythatallowssolidstosettleoutandwatertoberecovered.Cross-valleyanddikedimpoundmentsutilizeanembankment,oftenconstructedofcoarsecoalrefuse,whichformsabasinforslurryretention,asshowninFig.2andFig.3respectively...
