Book Description

Excerpt from Ore Deposits of the Silver Peak Quadrangle, Nevada A special type Of auriferous deposits in the Mineral Ridge district is represented by the Great Gulch mine. This is a deposit of auriferous arsenopyrite, which is believed to be similar in age and origin to the subsequent ores of the previously described gold mines. On the margins of the auriferous quartz district Of Mineral Ridge are a number of mines and prospects containing more silver than gold. The general geology is like that Of the gold-bearing ores. Alaskite and quartz lenses are intrusive into metamorphosed sediments and are accompanied by greenstone dikes. The ore, how ever, is subsequent and has formed along cracks in the primary quartz. The whole history indicated is analogous to those auriferous quartz mines of the Mineral Ridge district which show notable subsequent mineralization, although the char acter of the ore in the silver mines is somewhat different, in that more silver and copper in proportion to the gold are present. Another type of silver-bearing veins has a gangue of contemporaneous quartz, and has formed by replacement of dolomite near the edge of the auriferous quartz district. 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.