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SAFETY PRECAUTIONS FOR SPALLING COAL FROH TAE RIBS <br />• 1. The mining height will be controlled to minimize rib spalling. The open- <br /> ing height may be increased for the construction of overcasts and abnormal <br /> geological conditions. <br />2. Precariously hanging pieces of rib coal will be barred down before wrk in <br />the area begins. Because of strong jointing in the coal, the ribs will <br />not be barred down as a normal rib control procedure except, as mentioned <br />above, if obvious potential hazards exist in a working place, <br />3. p'hen considered necessary by the mine management, additional lateral sup- <br />port may be installed; such as shotcrete, bolts with bearing plates, wire <br />mesh or timber lagging. <br />4. Entry widths will be cut twenty feet or less. Roof bolts will be in- <br />stalled on five by five (5 R 5) foot centers, and [he outer bolts will be <br />kept as close as possible to the ribs. k'hen the distance between the out- <br />er bolts and the rib exceeds five (5) feet, additional bolts or timber <br />will be installed. <br />5. All mine personnel will be properly instructed in the procedures of in- <br />stalling lateral support, working around ribs, and barring down loose or <br />precariously hanging coal. All personnel will be trained [o confine their <br />work activities to the center portion of the entries as is prudently or <br />reasonably possible. <br /> <br />Page Twelve <br />Initial 11/01/86 <br />