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,, <br />GENERAL ROOF SAFETY PRECAUTIONS <br />1. This is the Roof Control Plan which will be suitable to the prevailing geological conditions during <br />development and longwall mining. <br />2. Persons shall be protected from falling material at drift openings by steel arch plate or by steel arches set <br />on not more than 4 ft. centers with no less than 4" x 4" wood lagging installed between the arches. The <br />arch structure shall be of sufficient size to prevent falling or rolling debris from entering the drift opening. <br />The arch structure may be replaced with a concrete structure. No mining within 150 ft. of a seam outcrop <br />is planned. <br />3. Where mobile equipment may operate, all crossbars or beams shall be installed with some means of <br />support that will prevent the beam or crossbar from falling in the event the supporting legs are <br />accidentally dislodged. <br />4. Supplemental supports such as cribs and posts shall be installed tight and on solid footing. <br />5. Tunnel liners and arches used as primary support shall be installed in accordance with manufacturer's <br />recommendations and a Roof Control Plan addendum submitted to MSHA for approval prior to installation. <br />6. When subnormal roof conditions are encountered, indicated, or anticipated, the roof support shall be <br />supplemented with additional support materials in order to maintain the purpose for which the entries <br />were intended. <br />7. When adverse roof conditions are encountered, the depth of cut will be reduced. When conditions <br />improve, at least one 20-foot cut will be taken in good roof and the roof evaluated by a mine official before <br />extended cuts are resumed. <br />8. Miners will be positioned in a manner that they cannot be struck by temporary tensioned cables, wire <br />ropes, chains, or slings that break or slip. All rigging will be maintained in good condition. All slings and <br />rigging will be utilized in accordance with manufacturer's recommendations and will incorporate adequate <br />safety factor above their rated capacities for anticipated loads. Hand-held tools or mobile equipment <br />provisions that are designed and utilized for that purpose which requires close proximity of the employee <br />will not be regulated by this provision. <br />9. Where necessary, supplemental supports such as rib mesh, timber or equivalent, or a combination will be <br />provided at refuge alternative locations. *- rpCr Roof' ;V/ _ L ?.s S',?PoXr-fZ /.v A ccc2bAn/Cls <br />W !ice! r74 e- A PP20Ve-a ROOF eo.vT72-04. PA.A.V. <br />10. Barrier pillars will be a minimum of 190 feet between the West Mine District development entries and the <br />South West Mine District. <br />RANGES BMAM AS PER <br />M. d -Vo 4,VX".V <br />A @HONE CONV€kSAT{Or??Ylirl <br />C D e? <br />? oq <br />ON 1149 <br />PAGE 3 11/11/09 <br />APPROVED <br />DEC - 9 2W9 <br />C,kiiS,H