The objective of the BX in situ oil shale project is to demonstrate the technical feasibility of using superheated steam as a heat carrying medium to retort in situ the oil shale in the Green River Formation "leached" zone and provide a mechanism for the recovery of this shale oil with a minimum impact on the environment. Utilizing primarily the natural porosity in the leached zone, approximately one trillion BTU of heat will be injected into a site over a 2 year period to heat to retorting temperature a shale zone approximately 550 feet thick and covering about one acre. The field project is located at Equity's BX in situ site in Rio Blanco County in northwestern Colorado.