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• A main mine fan will be provided to exhaust air outside the mine. The <br />projected location of the mine fan is on the Drainage and Sediment <br />Control Plan Map (Map 6). Because of the compact nature of the <br />operation, this fan should provide adequate face ventilation such that <br />no auxiliary fans will be necessary to improve or supplement mine <br />ventilation. <br />Permanent stoppings will be erected between intake, return, and neutral <br />airways behind active working sections. They will direct and separate <br />intake, neutral, and return airflows. All inactive working areas that <br />are not being used for haulage, travel, air courses, or extraction of <br />coal will be sealed with explosion proof seals. In every sealed area, <br />one or more explosive proof seals will be fitted with a pipe and a valve <br />in order to permit air sampling and determine the pressure on the seals. <br />All permanent stoppings and seals will be made of fireproof materials, <br />such as cement blocks, cinder blocks, or galvanized steel and will be <br />constructed so as to minimize leakage. <br />• Temporary stoppings will be used in active working areas where frequent <br />changes in air flow may be necessary. They will be constructed of jute <br />fabric, urethane-coated jute, plastic, wrought lumber covered with <br />plastic or telescoping sheet metal sections. They will be installed so <br />as to minimize air leakage. <br />Overcasts will be used as necessary and will serve as an air bridge to <br />allow two air streams to cross without mixing. They will be constructed <br />of fireproof materials, such as concrete or steel. Where only small <br />volumes of air are involved, pipe overcasts will be constructed. <br />In order to prevent short circuiting, mine ventilation while passing <br />from one air course to the other, mine doors will be installed in•pairs <br />in certain areas to form an airlock. <br />C~ <br />2.05-8 <br />