Among them, the sixth chapter is the most important part of the book. In addition to summarizing the mature technologies of gold and silver extraction, many new technologies, new processes and various technical equipment, methods and technological processes are introduced, including cyanidation, carbon slurry method, resin method, heap leaching method, mobile urea method and various new technologies of gold and silver extraction, as well as refractory gold ore treatment and gold and silver smelting and purification technologies. This book is systematic, comprehensive, advanced and practical, and can be used as a reference book for leaders, management cadres, technicians and production workers engaged in gold and silver production to master the basic theories and technical methods of gold and silver production. At the same time, it is also used as a professional teaching material for gold and silver production and mining enterprises to train workers and cadres.