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Inspecton <br /> Overburden drills (foreground) are preparing a layer of interburden for blast <br /> and subsequent removal of the spoil material by the dragline� (background) . <br /> Soon after the dragline removes the spoil material, the exposed coal seam car <br /> mined using a P&H backhoe to load a 170-ton truck. <br /> Figure 5 <br /> r <br /> ® iF <br /> b <br /> s <br />