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Various stoppings throughout the mine will be equipped with a man door <br />r <br />i 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 will be used to direct air intake through the working faces <br />and into the return air. Neutral air will not sweep across the working <br />faces but will be directed by stoppings and a regulator into return air <br />courses. The return air from each section will be directed by <br />stoppings, overcasts, and regulators to an existing entry drift to be <br />exhausted through the fan into the open 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 />r~ <br />LJ <br />2.05-9 <br />