Comprises 62 refereed research papers, shown in full color, from a symposium devoted to scientific investigations of geology, ores and metal exploration. Topics include mineral formation, geophysics, lithogeochemistry, stratigraphy, tectonics, and geothermal energy as related to metals and mining in the western United States and South America. Metals discussed are gold, arsenic, silver, tungsten, and copper as located in numerous hydrothermal and geothermal mineral formations.