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<br />_~ -- ~- . <br />- .~ <br />- a <br /> <br /> T <br />_ o <br />- a <br />=- c <br /> ~o <br />0 <br />== eo <br /> o< <br /> ea <br /> << <br />-- o <br />o <br /> ~Q <br />5 <br />_ <br />__ / ~ <br /> / <br /> ~ <br /> <br />• ~ <br />- Affected / <br />Affected <br /> Overburden / `,~y ~` Overburden <br /> Bcrren / ~ <br /> member / <br /> <br />/ ` <br />--. <br />/ ~ <br /> Unaffected ~ <br /> / Overburden <br />_ <br />__ ~ / <br />~,~ z. (no subsidence) <br />~.a <br /> <br /> <br />.._ <br /> <br />F coal seam w~ <br />~~.~' <br />.'~'c_ ~ °^ d~.r~ , <br />Q Q <br />)~'`' _°:cySC~'o <br />I~-coot~l, --safety zone-'~-coal -~-I <br />_- mined (50% of coal left in place) mined <br />= aut out <br />Figure Z: Idealized diagrem of safety zone <br />_ under the Dry Fork of `Minnesota <br />Creek. <br />=~ <br />ccllapse zone <br />- (li) <br />