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Excerpt from Third Report of Progress in the Laboratory of the Survey at Harrisburg Near Dillsburg in York county there is an important group of magnetic iron ore mines, connected with the Mesozoic sandstone, which have of late received consider able attention from owners of blast furnaces. These ores, carrying only a small percentage of phosphorus, have been largely used in the manufacture of Bessemer pig iron. Some of them carry a considerable percentage of sulphur as iron pyrites, and all Of them contain large quantities of lime and magnesia in the form of silicates. In this and in many other respects they resemble the celebrated Cornwall ore of Lebanon county. 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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