I am a geotechnical engineer in the mining industry and those of us working for mining companies in the United States get information on geotechnical products at conferences. Annual conferences are common with most professional organizations, and l suggest you get in touch with some of these professional organizations to get information on how to market your products. Some of the popular professional organizations/conferences to consider are American Society of Civil Engineers(ASCE), American Rock Mechanics Association (ARMA), Association of Environmental Engineering and Geologists (AEG), and Slope Stability Conference.