Under a cooperative agreement between the DOE and HYCRUDE Corporation, HYCRUDE has simulated the operation of a conceptual commercial HYTORT pant for each of the six eastern oil shales studied under the three-year program, using a computer program developed by HYCRUDE. The bench-scale unit (MBU) tests were conducted by Institute of Gas Technology (IGT). The MBU data were then scaled up by HYCRUDE to simulate HYTORT plant operations based on 50,000 BPCD capacity. Based on the process simulation results, the economics of HYTORT operations for these eastern oil shales have been examined in terms of the capital costs, operating costs, utility costs, shale costs and total product cost. The results indicate that the product oil cost is primarily a function of shale grade.