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Excerpt from The Mineral Industry of the British Empire and Foreign Countries, Vol. 2: War Period; Coal, Coke, and by-Products, 1913-1919 Igneous intrusions have materially altered the quality of the coal in some districts - especially in northern Natal, where dykes passing through the Coal Measures have destroyed the value of the coal for short distances from the planes of contact, roughly equivalent to the thickness of the dykes. Intrusive sheets in contact with a seam usually destroy its value, and, when separated from the coal by sandstone and shale, which form the main body of the Coal Measures, their effect is roughly proportional to the thickness of the sheet, and varies inversely with the distance of the sheet from the coal. The high calorific value of some of the Natal coal seams is attributed to this cause. It seems probable that, in some cases, hot mineral solutions have penetrated the laminations of the coal seams and have deposited their contents, thus increasing the relative percentage of the ash. In the coal, and, sometimes, driving 08 an appreciable quantity of volatile hydrocarbons. 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.

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