Recently a massive hydraulic fracture {MHF) treatment was performed in Mitchell Energy well Muse-Duke #1. The fracture is intended to stimulate gas production from the Cotton Valley Limestone formation. Almost 900~000 gallons of fracturing fluid and 2.8 million pounds of sand proppant were pumped in the fracture. It was estimated that a fracture 210 feet high by 5400 feet long (2700 feet each wing) would be generated. The treatment is intended to drain 640 acres of reservoir. As part of a DOE/Mitchell Energy joint project, Terra Tek has provided laboratory and field measurements in support of the design of this stimulation treatment. Furthermore~ the post stimulation treatment has been predicted based on various measured parameters. This report presents the data obtained in the laboratory and field program and their implications on the economics of MHF stimulation of tight gas formations at the Cotton Valley, Texas fields. Laboratory mechanical properties and field in situ stress measurements were performed to evaluate the containment of a MHF treatment. To assess productivity of the MHF treated well, laboratory tests were performed to determine the interaction between various fracturing fluids, proppant concentration and the limestone cores. All the laboratory tests were performed under simulated in situ conditions and treatment schedule.