1941 Open-Cut Metal Mining Bureau of Mines Bulletin 433 Maps Photos original

Original 1941 United States Department of the Interior, Bureau of Mines publication titled Open-Cut Metal Mining, Bulletin 433.  Written by E. D. Gardner and McHenry Mosier and published by the United States Government Printing Office in Washington, D.C.  This detailed technical bulletin covers historic open-pit mining methods and operations, including:  * Iron, copper, gold, and other metal mining * Drilling and blasting * Excavation and power shovels * Rail haulage, trucks, tractors, and bulldozers * Crushing and screening plants * Labor, operating costs, and safety methods * Individual mines and mining districts throughout the United States  The publication contains numerous black-and-white photographs, diagrams, mine layouts, technical illustrations, and large foldout maps and plans. Examples shown include the Pacific Mine in Aurora, Minnesota, Mesabi mining operations, and detailed mine sections and equipment layouts.  The front cover bears a period ownership stamp from Carpenter Exploration Co., Van Horn, Texas, adding mining-industry provenance.  Condition is acceptable vintage condition with overall age toning, cover discoloration, edge and corner wear, surface marks, and wear along the spine. Interior pages and foldouts appear intact based on inspection, though every page has not been individually photographed. Foldouts show their original creases and may have light edge wear. Please examine all photographs carefully for exact condition.