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t~- <br />o~ <br />x <br />W <br />a~ <br />E <br />1- <br />a~ <br />a~ <br />t <br />3 <br />0 <br />c <br />m <br />a <br />v <br />U <br />100 '".' -- -.. <br />~ ~ ` ~ ~ S/NKHOL ES (T61 <br />90 • ~ <br />80 ~ <br />~ ~ SINKHOLES AND TROUGHS, <br />~ , INCLUD/NG THOSE OF <br />to ~ l UNSPEC/F/ED D/MENS/ONS <br />^ 1 , (/631 <br />~ 1 <br />50 <br />EXAMPLES: <br />40 , ~ d. 60 PERCENT OF THE SINKHOLES <br />DEVELOPED MORE THAN 47 YEARS <br />0 ~ AFTER ~11NING <br />30 ~ b. 10 PERCENT OF THE SINKHOLES <br />TROUGHS (/3J ~ ~` afVELOPED MORE THAN T8 YEARS <br />20 ~ ~ TER MINING. <br />to b. ~ ~~ <br />~ ~1 <br />_... <br />0 "' . <br />0 10 20 30 40 50 60 70 80 90 100 <br />Time Interval, T, years <br />Time Interval Between Mining and Surface Breached or Dropped <br />(Gray, Bruhn & Turka, 1977) <br />