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is circulated through the retort from top to bottom. About 30Y is recycled back to the top of the retort and about 70o is vented to be replaced with an equal volume of new air to provide oxygen for the process. Once burning _ commences a retorting front is established ahead of the flame front. Kerogen in the marlstone is thermocracked at approximately 900° F. The oil flows down through the rubble to the bottom of the retort where it is collected in a sump. Excess carbon remaining from the thermocracking process provides the fuel. Some gas, including carbon monoxide, hydrogen, methane, ethane and other light hydrocarbons, is produced from the shale during retorting. The gas taken out of the retorting cycle contains essentially no oxygen. It is a low BTU fuel that is expected to be burned in turbines to provide power for the entire operation, with excess power to be returned to the Colorado distribution grid. • Disposal Pile and Working Area Figure 1 shows the location of the rock disposal pile in the NWti, Section 25, T7S, R97W in a gulch locally known as "Dry Gulch" at the mouth of the exist- ing mine portals. The disposal pile will cover about 30 acres. During the period of construction surface structures will be about as they are now, an "upper portal" with four adits and a "lower portal" also with four adits. The approximate extent of future underground workings in the NE~a, Section 25 is shown also. Certain more prominent temporary structures expected to be removed or abandoned within the next year or two are shown too. Figure 2 shows the predicted waste production plotted against oil production. A cubic yard of broken material weighs about 1.35 tons, assuming a specific gravity of 2.2. No decision on the scale of operations at the Logan Wash site past Rooms 4 and 5 has been made and none is anticipated before mid-1976. -2-