Texas lignite deep-basin

Resources. Near-surface lignite is defined as that under less than 60 m. of cover and deep-basin, under more than 60 m. of cover. Near-surface resources are set at 21.2 billion metric tons (O. These resources occur primarily in the Wilcox (71%) and secondarily in the Jackson (22%) and Yegua (7%). Geographically over 90% of the resources are found north of the Colorado River or in east Texas (Figure 2). 

Figure 3. Distribution of deep-basin lignite in Texas (1).

Mineral matter. Guven and Lee (11) have performed a characterization of the mineral matter found in several deep-basin lignite seams. Using core samples from Shelby, Nacogdoches, Panola, and Rusk Counties in east Texas (Wilcox Group), mineral matter has been processed using low temperature ashing (LTA) procedures. 

Tewalt and others have extensively analyzed 85 east Texas, deep-basin lignite samples collected from 18 different seams and five stratigraphic horizons in the Wilcox Group (14). In the Sabine Uplift area, among the trace elements of greatest environmental and health concern in coal (As, Pb, Se, B, Hg, Cd, and Mo), only the mean of Se (10.2 ppm) exceeds that of the average for U.S. lignite (5.3 ppm), whereas As is less (3.4 vs. 

Since 1975 there has been a substantial amount of research and development on underground coal gasification (UCG) for Texas lignite, stimulated by the large resources of deep-basin lignite and proximity to Industry in the Gulf Coast region which uses... 

---