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• Various stoppings throughout the mine will be equipped with a man door <br />or drop door to allow access to the entries which have been sealed off <br />by stoppings. These doors will be carefully built so as to minimize <br />leakage. <br />Bulk travel curtains and brattice will direct the flow of air from the <br />intake across the working faces and into the return entries. <br />The overall circulation of air through the mine will proceed in the <br />following manner: An externally mounted exhaust fan will create a <br />negative pressure and draw air into the mines through two portals <br />intakes. Intake air will then be directed through the mine by <br />stoppings, overcasts and regulators to the working faces of each mine <br />section or working panel. At the working faces of the section, brattice <br />and curtains, or auxiliary fans and tubing, will be used to direct air <br />intake through the working faces and into the return air. Neutral air <br />will not sweep across the working faces but will be directed by <br />• stoppings and a regulator into return air courses. The return air from <br />each section will be directed by stoppings, overcasts, and regulators to <br />an existing entry drift to be exhausted through the fan into the open <br />air. <br />Roof Support. Roof control will be based on a conventional spot bolting <br />plan approved by the Mine Safety and Health Administration; conventional <br />supplemental materials and supports will be used as necessary. <br />During mine development, timbers with cap blocks and wedges will be <br />installed as necessary down roadways and crosscuts. Depending upon the <br />conditions encountered, other supplemental and temporary supports such <br />as metal posts, jacks or cribs in conjunction with wooden cap blocks, <br />footers, planks and beams will be installed as needed. <br /> <br />2.05-9 <br />