Before becoming the 31st President of the United States, Herbert Hoover was a mining engineer and consultant. In this book, he presents his expertise on mining valuation, organization, and administration. Focusing on six key metals, Hoover's analysis provides a comprehensive guide to mining practices and economics in the early 20th century. This book is essential reading for anyone interested in mining, economics, or the history of Herbert Hoover's career. 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 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. 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.