As the Beypazari Trona Mine in Turkey turns into its middle or late period of mining, plenty of well units situate at the edge of the mine area, where the trona bed is thin and its boundary is highly variable. While drilling horizontal intersected wells at this area with conventional gamma logging system, it is very difficult to ensure that the trajectory of the well to be remained at the trona layer, and the well sets were frequently blocked, or even abandoned during the process of solution mining. The newly developed azimuthal gamma LWD system, by adding focused gamma logging probe into conventional MWD instrument, is capable of recording gamma data of different window angles, to obtain gamma data of the specified orientation. The data is transferred from downhole to the receiver at the surface via mud pulse and processed. By comparing the gamma data at top and bottom direction, it can be determined that the drill bit is about to enter the ceiling or floor of the trona bed. This is an important information for the MWD engineer to adjust the tool face of directional instrument in time, to ensure the ratio of the trajectory within the trona bed. Besides its application in the workover the blocked well sets, the technology could also be applied directly into the newly constructed horizontal wells. With the utilization of this technology, the occurrence of well set blockage is dramatically decreased.