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Professional Paper - United States Geological Survey (no. 38)
Professional Paper United States Geological Survey - no. 38 Author:Geological Survey Volume: no. 38 General Books publication date: 2009 Original publication date: 1905 Original Publisher: The Survey Subjects: Geology Science / Earth Sciences / General Science / Earth Sciences / Geology Notes: This is a black and white OCR reprint of the original. It has no illustrations and there may be typos or missing text. When y... more »ou buy the General Books edition of this book you get free trial access to Million-Books.com where you can select from more than a million books for free. Excerpt: PART II. -- ECONOM1C GEOLOGY. By J. M. Boutwell. INTRODUCTION. FlfXD WORK AND ACKNOWLEDGMENTS. The following portion of this report includes a narrative of the history and development of the Bingham district, descriptions of the character and occurrence of the ores, a discussion of the genesis of the ores, detailed descriptions of all properties whose workings were accessible at time of visit, and a consideration of placers and of general commercial applications. The field observations which form the basis for this portion, except a feV supplementary ones, were made during the season of 1900. Preliminary underground study was carried on during the summer in connection with areal mapping, and the detailed study was accomplished in the fall and winter. Thus, about the middle of July, Mr. S. F. Emmons and the writer made general observations on the underground geology and ore deposits in all the large properties and in important smaller ones. During the second week in August, on the arrival of Mr. Keith, and also at the conclusion of his areal work, in the first week in September, before he returned East, a few days were devoted to joint preliminary mapping of the underground geology of portions of two large properties and one smaller one. Early in October, after completing the areal mapping, the writer took up the critical detailed study of the underground geology and ore deposits of the district, and concluded that work the second week in December. During the follo...« less