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( • (b) To enable miners to perform their duties from a safe position without <br />exposure to falling material, a bar of suitable lenght and design shal. <br />be provided on all mobile face equipment, except haulage equipment, and <br />such bar shall be used when prying down loose material. (The length of <br />bar shall be suitable for the area involved in its use, i.e., construction <br />areas, rooffall areas, and other mining areas require a bar of suitable <br />length.) <br />B. All metal jacks shall be installed with a cap block bet~:een the jack and <br />the roof unless an oversize bearing plate of not less than 36 square inches <br />is provided. <br />9. In each active working place where roof bolts are installed, at least one <br />roof bolt hole shall be drilled to a depth of at least 12 inches above the <br />anchorage horizon of the bolts being used to determine the nature of the <br />strata. Such test holes shall be drilled at intervals not to exceed <br />100 feet. The test hole shall be either left open for examination <br />or a roof bolt of a length equal to (or greater than) the required test <br />hole depth may be installed and tightened provided adequate anchorage'is <br />obtained. <br />10. (a) Sidecuts shall be started only in areas that are supported with <br />permanent roof supports. Where the installation of additional supports <br />is reouired prior to starting the sidecut, such supports shall be shown <br />• on a sketch. Once the sidecut has been completed, the sidecut shall be <br />Supported by either temporary or permanent supports prior to working in <br />the intersection. <br />(b) During development, except where old workings are involved, mine <br />openings shall not be holed through into unsupported areas. When a <br />mine opening holes through into a permanently supported entry, room, <br />or crosscut, the intersection so created shall be considered unsupported <br />and no work shall be done in or inby such intersection until either: <br />(i) The newly created opening is permanently supported as indicated <br />in the approved roof control plan, or; <br />(ii) The newly created opening is timbered off with at least two rows <br />of posts installed on not more than 4 foot centers across the <br />opening. <br />11. An approved, calibrated torque wrench that will indicate the actual torque <br />on the roof bolts by a direct reading shall be provided on each roof <br />bolting machine in operation. <br />12. Immediately after the first bolt is installed in each place, the torque <br />shall be tested and thereafter at least one roof bolt out of every four <br />shall be tested by a qualified person, if any of the bolts tested do <br />• not fall within the required torque range, the remaining previously in- <br />stalled bolts on this cycle shall be tested. <br />8 <br />