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w <br />v <br />z <br />w <br />oc <br />J <br />U <br />U <br />0 <br />0 <br />U <br />z <br />w <br />w <br />a <br />ta. <br />• <br />,:.1.-- - <br />:u•.,••c~ c•s:s <br />~..J . <br />•r <br />1.~ ~ S1.'l'_ ~~SLS <br />1 t,- <br />t - <br />6 <br /> <br />7 <br />0 <br />South llfrican Codl Clines <br />Factor of Safety - 1320 WO'46 1-e <br />( 0.66 )(1.111 ) <br />W =Lease pillar widtll (ft) <br />h =Pillar height (Ft) <br />e =Extraction ratio; II =Depth (ft) <br />(Salamon S Hunro, 1961) <br />T-_-~-__--___.1.__._____.__ -~ _ <br />R -~--`" In Range R Ilalf Tl~e Stable Gases <br />~ 1 pre Most Dpnaely Concentrated ( <br />-~ ,-. ~ 1 1 <br />~ 1 ~ <br />Lover LSm1t of R SI 1.31 <br />~~ ., . , - I <br />~ Hean of R S 1.5T <br />v~~ ;~ ~ .:i ~ m <br />".~.:`~_.. ~ Upper Llmit of R S L.88 <br />:~: u <br />I' ~:~ 1 <br />~~ `~' ' ``(( <br />., ,~, \ <br />.:.. ~\ <br />:>::. .o.t~~ \. . <br />i <br />JS 10 1'. 70 <br />SI Sm Su <br />Safety Factor <br />• <br />]5 <br />7a <br />• <br />3S <br />