Excerpt from Shaft-Sinking: Under Difficult Conditions IT is believed that the translation of this work into English, undertaken with the Author's approval, will prove to be Of some value to mining engineers and students of mining. The subjects dealt with have been hitherto rather outside of the field Of practice Of American engineers, perhaps chiefly because there has been but little need thus far in this country for at tempting the development of such mineral deposits as are over laid by deep accumulations of unstable, water-bearing soils, or alternations Of these with rocky strata. Our mineral deposits are generally accessible by shafts sunk under more favorable conditions. Considerable areas Of the continental coal measures, as well as some of the important deposits Of salt, gypsum, etc., are covered by geological for mations of which no exact parallel has yet been encountered in this country. It would, for example, be difficult to dupli cate here at present such adverse conditions as are set forth in the geological sections described in the tables on pages 90 and 137, in point both of depth and of the extremely un favorable nature Of the soft, water-bearing strata overlying the mineral deposits. 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.