Solutions to improving the efficiency of production organization at semi-mechanized longwall face I-6-2, Bac Quang Loi coal mine

Dong Bac Corporation is the second largest coal producer in Vietnam with output accounting for more than 14% of the country's total production. According to the plan, coal production from underground mines is expected to increase to 60% of the total Corporation’s production by 2025. To increase coal production in longwall mining, Dong Bac Corporation applies advanced technological solutions to modernize production stages, with the notable implementation of the semi-mechanized longwall mining technology. This technology uses a single-drum shearer and mobile hydraulic supports. The use of the technology has encountered challenges and difficulties, resulting in low production efficiency. The highest output achieved in the longwall face only reached 70% of the initial design capacity. The article presents the current status of technological innovation in underground coal mining of Dong Bac Corporation. The primary research subject is the semi-mechanized longwall face I-6-2 at Bac Quang Loi coal mine of Company 790, Dong Bac Corporation. Based on analysing the causes of difficulties, the authors provide solutions to improving production efficiency, safety, and the environment. Some solutions have been used in practice and have achieved positive and promising effects. Adjustment of production cycle organization chart to align with mining conditions has resulted in an increase in effective working time and a 17% rise in coal output. Accordingly, the authors propose technological orientations for the development of underground coal mining at Dong Bac Corporation.