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• TP-2: <br /> Distance from headgate to TP-2 (x) : 820 ft. <br /> Surface elevation TP-2: 11,360 ft. <br /> Coal elevation at headgate: 9,095 ft. <br /> Surface elevation over headgate (from 1"=1,000' topo/mine map) : 11,360 ft. <br /> Depth to coal (H) : 2,265 ft. <br /> TP-2 x <br /> ly <br /> H no scale <br /> A-B bed 1-, longwall <br /> 301 <br /> Slope angle (0) : <br /> 0 = tan-1 x <br /> = tan-1 482 <br /> 820 <br /> = 30.450 <br /> • Apparent angle of draw to TP-2 (8 ; no subsidence detected): <br /> A = tan-1 x <br /> Hcos20 <br /> = tan-1 820 <br /> 2265cos230.45 <br /> = tan-1 820 <br /> 2265 0.74 <br /> = tan-1(0.49) <br /> = 25.970 <br />