As part of an ongoing effort to develop an assess the feasibility of underground coal gasification in New Mexico, a field study was performed to determine the natural flow characteristics of an undisturbed coal seam. Dewatering, air injection, and tracer experiments were conducted on a twohole test pattern, spaced 30 ft apart, in a 15-ft thick seam located about 500 ft below the surface. This was the first field experiment in coal to utilize a newly developed downhole measuring system designed and operated by Sandia National Laboratories. From the tracer flow logs and air acceptance tests we found that the formation allows gas flow with low water production. While some vertical variation in air flow and tracer residence time through the coal seam was found, all of the coal sustained flow trough a relatively low volume of active voids. Only 10 percent of the injected air was recovered and the recovery rate paralleled trends in the injection rate.