Excerpt from Modern Practice in Mining, Vol. 3: Methods of Working Coal A system of laying out the mine and of working the mineral might be pursued which would produce for a time a large output, but might result in the long run in the ruin of the mine. Then, coal mines, or portions of coal mines, have frequently in the past been lost through creep owing to a wrong system of working having been pursued. Again, the drowning out of a mine, or of part of a mine, has been brought about by projecting the workings to the dip, when, by a judicious system of working, they would either have been advanced to the rise, or some system of fore-draining arranged had it been necessary to work to the dip, and in either event adequate standage room with an under level drift would have been provided. The questions of haulage (see Vol. V.) and ventilation (see Vol. Also, will be governed, in greater or less degree, by the system of working pursued. The quantity in which the mineral is gotten and its nature are important features, so that the squeeze or weight of. The superincumbent strata may be properly regulated, with a View of preventing crush as in the case of a tender coal, or of obtaining fullest advantage of the weighting as in the case of a hard coal. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.