This book provides an overview of the Grass Valley District quartz mines, which are located in California and have a rich history. The author gives detailed descriptions of the geological formations of the area and the techniques used to extract the valuable quartz mineral. It also provides valuable insights into the history of the development of mining in America. 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.