Minesight Block Models And Rough Open Pits (1)

Transcript

  Block Models and Rough Open Block Models and Rough Open PitsPits ©2012 Dr. B. C. Paul©2012 Dr. B. C. PaulNote – hese slides contain !an screen shots #ro! the progra! Mine$ight Note – hese slides contain !an screen shots #ro! the progra! Mine$ight de%eloped & Mintec. Credit #or the progra! is gi%en to its de%elopers. hese de%eloped & Mintec. Credit #or the progra! is gi%en to its de%elopers. hese slides dra' on pre%ious !aterial prepared & the author and so!e o# the slides dra' on pre%ious !aterial prepared & the author and so!e o# the topics co%ered are also #ound in Mintec training courses.topics co%ered are also #ound in Mintec training courses.  Representing Ore BodiesRepresenting Ore Bodies ($o #ar 'e ha%e used contour lines and the $o #ar 'e ha%e used contour lines and the linker tool to set &ounds on ore &odieslinker tool to set &ounds on ore &odies (Disse!inated deposits lack #ir! ore&od edgesDisse!inated deposits lack #ir! ore&od edges()%en %ein deposits 'ith clear edges usuall ha%e )%en %ein deposits 'ith clear edges usuall ha%e grade %ariations 'ithin their li!itsgrade %ariations 'ithin their li!its (Ore&odies can &e e*pressed digitall & Ore&odies can &e e*pressed digitall & &reaking the ground up into large nu!&ers o# &reaking the ground up into large nu!&ers o# little cu&eslittle cu&es (his representation is called a +Block Model,his representation is called a +Block Model,(Because %er large nu!&ers o# &locks the Because %er large nu!&ers o# &locks the techni-ue i# #or co!puter &ased anal sistechni-ue i# #or co!puter &ased anal sis  Block Model denti#ication Begins Block Model denti#ication Begins /hen ou $tart Mine$ight/hen ou $tart Mine$ight ou !ust ha%e an ideaO# 'hat the coordinates re #or our ore &od  nd 'hat units &ecauseou ha%e to speci# Proect li!its.ou also need to ha%e n idea o# &lock si3e.  /e /ill 4ook at Block Models /e /ill 4ook at Block Models 'ith Open Pit this i!e.'ith Open Pit this i!e. ( $plitting &locks 'ith &enches is a !athe!atical co!ple*it $plitting &locks 'ith &enches is a !athe!atical co!ple*it ( r to !ake &lock height correspond to &ench heightr to !ake &lock height correspond to &ench height (Bench height is related to e-uip!ent si3eBench height is related to e-uip!ent si3e ($ho%els ha%e to &e a&le to dig to top o# &ench$ho%els ha%e to &e a&le to dig to top o# &ench(  &ig sho%el goes 'ith a &ig truck  &ig sho%el goes 'ith a &ig truck(Big sho%els and trucks go 'ith &ig deposits 5o&%iousl ou need an Big sho%els and trucks go 'ith &ig deposits 5o&%iousl ou need an idea o# ho' &ig our deposit is6idea o# ho' &ig our deposit is6 ( lso related to ho!ogeneit o# ore lso related to ho!ogeneit o# ore (  Bench 'ill generall !i* all ore o%er its %ertical height – i# ou need   Bench 'ill generall !i* all ore o%er its %ertical height – i# ou need %ertical selection ou need shorter &enches%ertical selection ou need shorter &enches (aller &enches usuall !ore econo!icaller &enches usuall !ore econo!ic (7e'er le%els to !aintain7e'er le%els to !aintain(4arger drills and !ore drill hole spacing4arger drills and !ore drill hole spacing