Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Excerpt from Mining Costs of the World: A Compilation of Cost and Other Important Data on the World's Principal Mines The writers have long believed that there is need for a book of this char acter, embodying in condensed form costs and other important operating data on the metal mines of the world. This book, which covers about three hundred and twenty-five metal mines, is not a text but a compilation of results actually Obtained at the various properties shown therein. It should be of material assistance to the engineer, manager, superintendent, operator and student. We realize that nearly every mining man has his own notebook, but rarely are these data complete and conveniently arranged in pocket book form. The examining engineer and Operator frequently find it difficult to Obtain reliable data in camps they are visiting. This book gives the desired information, embody ing as it does most of the principal camps of the world: It is evident that no just comparison can be drawn between any two mines, as no two are Operated under identical conditions. In a great major ity of cases we have given Operating results for several years. There is a constant aim to increase production with decreasing costs, but as this is not a rapid nor radical movement figures from year to year undergo very slight changes. It is our intention, however, from time to time to augment the book, adding new mines to the list, later data and more complete information. 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.