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Excerpt from Geology of the Area Adjacent to the Free Enterprise Mine, Jefferson County, Montana The cryptocrystalline silica veins commonly occur in groups having a lenticular pattern. Where quartz monzonite is the wall rock, they are bordered by an altered zone, but no alteration was noticed where alaskite is adjacent to the silica veins. These groups of silica veins and the enclosing altered country rock are called silicified zones in this report. No uranium minerals were ob served at the surface, but radioactivity anomalies were noted at 57 outcrops. Leaching by downward percolating waters has removed most of the uranium from the near-surface part of the Free Enterprise vein and probably has slightly enriched parts of it and the adjacent wall rock from the bottom of the leached zone to the ground water level. 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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