Dunham Craig graduated from the University of British Columbia with a Degree in Geology in 1988. From 1970 to 1983, he worked in the heavy construction industry and also operated his own construction company for seven years. Upon graduation from university, he served as a project geologist for Cominco Exploration Ltd. and later consulted for Cominco and Kennecott Canada Inc.

Subsequently in 1993, as the vice president of exploration and corporate development for Wheaton River Minerals, Dunham was responsible for the discovery of three mineral deposits at Wheaton River's highly profitable Golden Bear mine and for participating in the project through bankable feasibility and bank financing. He later directed the acquisition of the Bellavista Gold Project in Costa Rica and oversaw its design through bankable feasibility. From 2002 to 2005, he was a member of the initial management team of Glencairn Gold Inc. that acquired and developed two operating mines in Central America. Dunham joined Geologix in 2005 as its President and was later appointed CEO and President by the Board in 2006.