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1 � <br /> • MC-8: <br /> Distance from headgate to MC-8 (x) : 790 ft. <br /> Surface elevation MC-8: 11 ,619 ft. <br /> Coal elevation at headgate 90 from MC-8: 9,088 ft. <br /> Surface elevation over headgate (from 1"=1,000' topo/mine map) : 11,240 ft. <br /> Depth to coal (H) : 2,530 ft. <br /> MC-8 x <br /> JH no scale <br /> 9 <br /> A-B bed longwall 301 <br /> Slope angle (0) : <br /> 0 = tan-1 z <br /> = tan-1 378 <br /> 790 <br /> • = 25.57° <br /> Apparent angle of draw to MC-8 (A; no subsidence detected) : <br /> 8 = tan-1 x <br /> Hcos20 <br /> = tan-1 790 <br /> 2530cos225.57 <br /> = tan-1 790 <br /> 2530 0.81 <br /> = tan-1(0.38) <br /> = 20.99° <br />