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Mining Engineering Mine Ventilation Difficulty: Medium

Explosibility of H 2 by volume is . . . . . . . .

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A rod painted alternately red and white and used for marking stations called Dint header suitable for height of roadway not more than . . . . . . . . CMRS has experienced with a system of roof botting known as Prior to starting opencast working some trenches are excavated to expose the mineral body. These trenches are generally very long but limited in depth. What is its approximate depth? When the stratas are well stratified sand stone or shales, the local fall will take place within . . . . . . . . hours, after withdrawal of supports.