Oil and Gas Activity

Does anyone know anything about oil and gas leasing in Township 31 North, Range 50 East, Roosevelt County, Montana? I have had the minerals for years and have never been contacted. I wonder if there has been some hanky panky and the records no longer show me as the owner. Does anyone know anything about activity in this Township and is there a way of finding out if someone has fraudulently messed with ownership without making a trip to Montana? I live in Denver.