Laserfiche WebLink
SubTerra, Inc. Peabody Twentymile Coal, LLC April 11, 2016 <br />Subsidence Mitigation During 9 -East Undermining of the Energy Spur at the Foidel Creek Mine <br />Figure 4 contains a prediction for the travelling profile (profile parallel to face retreat) and Figure 5 <br />contains a prediction of subsidence along the energy spur indicating maximum effects between <br />Stations 18+00 and 19+00. <br />2.3. Subsidence and Gradient Change Prediction Along the Energy Spur <br />Table 1 and Figure 6 shows the predicted subsidence profile along the Energy Spur associated with <br />coal extraction in Panel 9 -East, with and without remediation. Maximum subsidence effects without <br />remediation are estimated at: <br />1. Maximum subsidence of 63 -inches. <br />2. Maximum slope change of 1.0%. <br />3. Maximum subsided gradient of 1.8% in the mining zone. It is noted that existing track <br />gradients exceed 2% up -gradient of where the Energy Spur crosses 9 -East. <br />These predicted impacts will require remedial actions to maintain the track within the gradient <br />tolerances required by the railroad. <br />5 PN: 2016-10 <br />