Numerous projects have been performed for Andalex. A technical review and recommendations were presented on the feasibility of converting mining operations in three seams from room-and-pillar to longwall. The project included reviews of the geologic setting, lithology, structure, and longwall mineable reserves, as well as evaluation of mine ventilation plan, methane control, ground control plan, and productivity. Longwall shield load capacity requirements were generated. A ventilation survey and network modeling were performed, leading to recommendations for new fan equipment for the Aberdeen Mine. Other projects have included an extensive investigation into face burst mechanisms, design of interpanel barriers, coal acquisition surveys for Colorado and Utah coal fields, and an ongoing ground control program. Ongoing studies have focused on sizing of gateroads and panel pillars as the mine progresses to deeper areas. Borehole pressure cells have been installed up to 300 ft into panel pillars, in situ stresses measured, and rock and coal testing completed.
