TKV's Mining Geology Joint Stock Company has successfully completed the MK1227 borehole, reaching a depth of 1,320 meters in the challenging terrain of Tràng Lương commune, Đông Triều town, former Quảng Ninh province. The geological conditions in this area are highly complex, with the site located far from residential areas and water sources. Drilling took place in a high-pressure water zone, characterized by thick sandstone formations with large porosities, frequently causing complete loss of circulation fluid, water intrusion, and water gushing incidents.