Excerpt from Geological and Geophysical Survey of Fluorspar Areas in Hardin County, Illinois: Part 1. Geology of the Cave in Rock District; Part 2. An Exploratory Study of Faults in the Cave in Rock and Rosiclare Districts by the Earth-Resistivity Method Part 1. Geology of the Cave in Rock district - Continued. Fluorspar deposits of the district - Continued. Structure of the deposits General form of the ore bodies Relation of ore bodies to minor folds Roof veins Floor veins Boundaries of mineral bodies Partings Bedding veins in roof shale Fluorspar content of mineral bodies Origin and geologic history of the deposits Views of previous writers Possible extension of the producing area Suggestions for prospecting and exploration Mines and prospects Mining methods Milling methods Economic considerations Uses and grades Production. 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.