This document contains papers that were presented at the Department of Energy's Sixth Annual Contractors Meeting on Containment Control in Coal-Derived Gas Streams. The meeting was sponsored and hosted by the Department of Energy, Morgantown Energy Technology Center, and was held June 4-5, 1986, at the Sheraton Lakeview Conference Center in Morgantown, West Virginia. This year's meeting was attended by 176 individuals from industry, academia, national laboratories, the Department of Energy, and other governmental agencies. The purpose of this meeting was to present technical information on high-temperature, high-pressure control technologies for particulate and chemical contaminants in coal-derived gas streams. The meeting provided a forum for the exchange and dissemination of contaminant control information generated under the sponsorship of the Department of Energy. The contaminant control technologies and instrumentation research have direct application to pressurized fluidized-bed combustion and coal gasification as well as a number of additional Fossil Energy research programs, commercial processes, and noncoal related operations. Selected papers have been entered individually into EDB and ERA.