. . . "Chelsea Raley examines a soil sample using the Mineral Isotope Analyzer at the mineral resources development unit lab at the University of B.C.Photograph by: Sara E. JenkinsIn the old days, geologists would scrape up soil samples looking for traces of the copper, gold, molybdenum or other minerals they were looking for in deposits close to the surface.More recently, they???ve discovered more defin" . .