Oil and Gas Mineral Lease Wood County Texas

My brother and I have been contacted by Gulftex Exploration and Development LLC , 3030 LBJ Freeway, Dallas, Texas regarding an offer to lease our mineral interests in Wood County, Texas. What is the going rate per acre and royalty percentage rates in August, 2012 in Wood County, Texas ? Their offer seems quite low

Also, has anyone had any dealing with Gulftex Exploration and Development? Good? Bad? Fair?

Eric Steger