The final, corrected field-test data for the Pricetown I underground coal gasification project are averaged into five phases containing 63 stages. The resulting data are used to determine probable affected geometries of the reverse combustion linking (RCL), combustion link enhancement (CLE), and forward gasification (FG) phases. After RCL, the link diameters between production/injection wells 2-3 and wells 1-2 were 2.39 ft and 2.56 ft/sup 3/, respectively. About 71% of the volatile matter in the link was removed. CLE of the porous link occurred under both sublaminar and laminar flow regimes, with a consumption of about 95% of the volatile matter in the link. The CLE computer model predicts a link cross section of about 7 ft high by 32 ft wide at the injection well just prior to gasification. The extent of gasification during linking is found to be insignificant. During forward gasification, the absence of water (steam) and volatile matter near the injection region resulted in partial oxidation of the char being the major gasification reaction followed by downstream or periferal devolatilization. Based on thermocouple indications and the FG computer model cavity growth predictions, it appears that only 20% of the char reacted giving an average cavity height of 3.3 ft and maximum width of about 30 ft. Approximately 52% of the coal affected was recovered during the field test. The FG phase was apparently terminated because of the rapid temperature drop when the burden became exposed as indicated by thermocouple measurements and the FG model temperature calculations. This led to condensation and solidification of tars in the link and wells. It is imperative to maintain base temperatures by providing superheated steam and oxygen in future field tests, as well as to improve the quality of the product gas. 43 figures, 13 tables.