Terrones specialized in the Latin America regions. He then spent 10 years at Cerro de Pasco, Peru, first as a mine geologist, then as exploration chief. Upon returning to Mexico, he worked for the Cananea Consolidated Copper Company (prior to its Mexicanization) and then embarked on an illustrious career as an international consultant. He was also general manager of exploration for Homestake Mining Company in Mexico. While Terrones was at Cerro de Pasco, Dick Wyman, following receipt of an M.Sc. degree from the University of Michigan and a short stint as a field geologist with New Jersey Zinc Co., joined the Cerro de Pasco mine geology staff, and thus began a life-long friendship and close professional association between the two. Wyman returned to the United States, established his own exploration company, and also earned a Ph.D. degree from the University of Arizona. He operated precious metal mines at Virginia City and Nelson, Nevada. Dick joined the faculty at the University of Nevada, Las Vegas, specializing in economic geology, engineering geology and civil engineering. He is the author of numerous technical articles on precious metal and uranium geology, radioactive waste management and environmental geology.