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<br />• <br />• <br />• <br />Srnrca Coal Cumpan~• High~~all Mining Addrndum <br />MSHA LD. 05.00304 March 15.2004 <br />Barrier Pillar ~1`idth - tia~c Crcck ticam <br />0 <br />5 <br />J <br />a <br />o< <br />w <br />a <br />a <br />m <br />0 <br />w <br />O <br />w <br />Figure 3Sb• Barrier pillar design charts for Safe Creek seam. Seneca 11-`~' Yit. <br />G 5G ,00 750 200 250 300 350 100 <br />DEPTH OF COVER, K <br />