Laserfiche WebLink
METHANE CONTROL ON OUTBY AREAS <br />• <br />1. The methane content in any return air course other than an air <br />course returning the split of air from a working section shall <br />not exceed 2.0 volume per centum, The methane content in the <br />air in active workings shall be less than 1.0 volume per <br />centum. If at any time the air in any active working contains <br />1.0 volume per centum or more of methane, changes or adjust- <br />ments shall be made at once in the ventilation in the mine to <br />reduce the methane concentration to less than 1.0 volume per <br />centum. <br />2. A bleeder system will be used in all active pillar areas during <br />second mining, except in mining areas where there is a high <br />risk of spontaneous combustion of coal unless methane levels <br />reach a significant amount, as stated in #1. Anticipated air <br />quantities and methane concentrations throughout the bleeder <br />• system, as well as methods used io keep the bleeder airways <br />open, will be entered on the mine maps at the appropriate <br />places. <br />3. Whenever a working section is completed and mine management <br />does not wish to continue to ventilate the area or permission <br />to ventilate the area is denied, the area shall be sealed im- <br />mediately, and work shall be started to seal the area within <br />one working day after the section is abandonetl. Location of <br />seals, depth of cover and barrier pillar dimensions bordering <br />such areas will be indicated on the mine map. Pillars will be <br />of sufficient size and number to protect the seals. A drawing <br />of an explosion-proof seal accompanies this plan, <br />• 1 Page Ten <br />Revised 04/13/81 <br />