Excerpt from A History of the Precious Metals, From the Earliest Periods to the Present Time: With Directions for Testing Their Purity; And Statements of Their Comparative Value, Estimated Cost, and Amount at Different Periods; Together With an Account of the Products of Various Mines; History of the Anglo-Mexican Mining Companies With respect to our sources of inform ation, it will be seen that many authorities 'are quoted in the body of the work, and among them Mr. 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.