Special Reports on the Mineral Resources of Great Britain, Vol. 12

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Excerpt from Special Reports on the Mineral Resources of Great Britain, Vol. 12: Iron Ores (Contd.), Bedded Ores of the Lias, Oolites and Later Formations in EnglandAnother alteration, certainly of subsequent age, consists in the enrichment of an ore bed by weathering. From that part of it which has been exposed at the surface by denudation, enrichment has taken place mainly by the removal of carbonate of lime in Solution, whereby the percentage of iron has been increased. In some districts profitable working is confined to the areas in which this enrich ment has taken place.An estimate of reserves of the bedded Mesozoic ores falls under the same two heads as that for reserves of coal, namely areas which have been proved, and areas in which the existence of ore is regarded as probable on geological' evidence. An estimate published in the Summary of Progress for 1918, p. 7 accordingly gives the figures for Mesozoic cres under the two titles Reserves more or less developed and Probable additional Reserves. The present volume contains the evidence on which those figures are founded.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.