25th oil shale symposium proceedings
From the Foreword * * * The 25th Annual Oil Shale Symposium sponsored by the Colorado School of Mines and the U.S. Department of Energy signifies the end of 28 years of shale oil research designed to produce a viable commercial shale oil industry during the 20th Century in the United States. The closing by Unocal in 1991 of its processing plant to produce shale oil at Parachute, Colorado, ended this phase of development of the commercial shale oil program. Although there are other players still active in oil shale, none are concerned primarily with producing liquid fuels from oil shale. This era ...