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... WHAT IS THE CAUSE OF COLLIERY EXPLOSIONS ?— Mr M. Ennor writes thus to the Mining Journal :-There is nothing strange or mysterious in these occurrences, for as the mines get deep such large spaces are opened that there is a waut of a sufficient current of air to keep pace with them. Large and deep mines will continue to ex- plode, until men will not be found to work in them. If the tide once ...