Instrumentation GDD Inc. is a world leader in high-tech geophysical instrumentation for mining, groundwater prospecting and exploration. Since 1977, GDD has developed, manufactured and sold a wide range of electromagnetic (EM) and Induced Polarization (IP) geophysical instruments. GDD’s team of researchers, engineers, technicians and geoscientists is committed to facing challenges related to mining and exploration fields. Our solid professional experience and knowledge of the geophysics is a valuable asset to the mining industry. We are renowned for our customer service, and rugged and reliable instrumentation. The company offers documentation and services in French, English and Spanish. GDD manufactures, develops, sells, repairs and supports it’s products worldwide. Established in Quebec in 1976, GDD’s head office, production line, R&D and administration facilities are located in Quebec City, Canada.