Principles of Metal Mining (Classic Reprint)

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Excerpt from Principles of Metal MiningThe use of gunpowder for blasting in hard ground, said to have been first used in the parish of Breage in Com wall, is scarcely three centuries old, and even yet the ancient mode of rendering the rock brittle, by first heat ing it by means of a fire of brushwood kindled in the end, and then throwing cold water upon it, is still in use in some of the continental mines.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.