Mr. Turbull is the President of Lakehead Geological Services Inc., a consulting company since 1990. He is a member of the Engineers and Geoscientists of British Columbia.

Mr. Turnbull had a long tenure with Oromin Exploration Ltd, as geologist and Director until its takeover by Teranga Gold Corp. in 2013. Mr. Turnbull has managed and served on the boards of several junior exploration and mining companies with assets ranging from early stage to advanced projects worldwide. 

Mr. Turnbull was part of teams responsible for the exploration and development of the Eskay Creek Gold Deposit in British Columbia, Canada, the Petaquilla Cu-Au Porphyry Deposit in Panama, the Mt. Kare Gold Deposit in Papua New Guinea and the OJVG/Sabodala Gold Deposits in Senegal.