"This quarterly progress report covers research work performed at the University of Texas at Austin on evaluating chemical, mechanical and environmental factors in underground gasification of Texas lignite. The departments involved include the Departments of Chemical Engineering, Environmental Health Engineering, and Petroleum Engineering, and the Bureau of Economic Geology. This work is being performed with support from the DOE, eight private companies, and the Environmental Protection Agency. The purpose of this study is to find a model, based on physical considerations of a burned-out coal seam, which describes the flow patterns during underground coal gasification."