Excerpt from The University of Colorado Studies, Vol. 2: May, 1904 to June, 1905 Due credit is given under each note when taken from any of the above-mentioned sources. In the lead and copper smelting notes, and in some of the cyanide notes, the methods given have been in almost daily use by the author of this thesis for some time. All the methods given under lead and copper smelting have been checked, and are known to be accurate. 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.