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<br /> <br />Calculations for protection of surface structures: <br />Input Data: <br />Protection Area: <br />Average overburden depth ....... <br />Structure width (includes all buildings).... <br />Structure length .(includes all buildings).. <br />Minimum angle of protection ................ <br />Maximum angle of protection ................ <br />Structure dimension adjustment <br />(15' step out on all sides). ............. <br />Maximum extraction in protection area ...... <br />Calculated Parameters: <br />Structure Protection Area: <br />Angle Area Area Total Extracted <br /> Width Length Area Area <br />(degl (ftl (ftl (ftl2 fftlz <br />15 335 335 112276 56138 <br />20 416 416 172834 86417 <br />25 502 502 251698 125849 <br />30 595 595 353990 176995 <br />420.00' <br />80.00' <br />80.00' <br />15.0 0° <br />30.00° <br />30.00' <br />50.00$ <br />Note: The 20 to 30 degree areas are calculated to be applied <br />in areas of steep slopes. Since this area is flat the 15 <br />degree area was used in the illustrations. <br />Table Ii. 6DP5 calculation to determine the area of coal to <br />be left in the Golden Eagle Mine if the panel progressed <br />under the Tatum House to protect it from mine related <br />subsidence damage. <br />13 <br />