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2 Journal of Sustainable Mining

2 2025

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Study on ratio of cutting height to caving height for efficient top coal recovery in extra thick and gently inclined coal seam – a case study of seam 7 Ha Lam coal mine, Vietnam

Pham Duc Hung, Le Tien Dung, Nguyen Phi H., Pham Van Quan

Journal of Sustainable Mining

2025

Vol. 24, iss. 2

203--213

The mechanized longwall top-coal caving technology (LTCC) has been used in Quang Ninh underground coal mines owned by Vietnam National Coal – Mineral Industries Holding Corporation Limited (Vinacomin). The application of the LTCC technology has achieved significant achievements, contributing to the production of coal for national economy development. The use of LTCC has shown that the top coal recovery efficiency is directly affected by the sequence of top coal drawing, ratio of cutting height to caving height, and caving span. These parameters, especially for extracting thick and gently inclined coal seam conditions as in the Quang Ninh coal field, have not been satisfactorily investigated in previous studies, which limits the advantages of this advanced mining technology. By using the numerical software PFC 3.1 as the main analysis tool, this paper studies the relationship between cutting height and caving height for efficient top-coal recovery in extra thick and gently inclined coal seam. Taking the condition of Seam 7, Ha Lam coal mine as a case study, the paper recommends the mine to re-organize its operation with a cutting height-to-caving height ratio of 1:5.25 and caving span of 1.2 m per mining cycle for maximum efficiency of the LTCC operation.

Optimizing underground construction and plan management for the Mong Duong coal mine, Vietnam

Nguyen Phi H., Nguyen Thi K. Thanh, Pha Duc H., Quang Phuc L., Vu Thai T.D.

Journal of Sustainable Mining

2025

Vol. 24, iss. 1

130--144

Mong Duong mine’s output objective is 1.5 million tons, which requires approximately 10,000 m of tunnel excavation each year. Because of the complicated geological features, the actual work is vastly different, necessitating regular changes in design and technical approaches, as well as plans for material supply, money, and staff. On the other hand, office personnel visit the construction site to update the work status after each report, and the department head and board of directors make choices on development and execution. This process takes time because it is carried out manually. As a result, a solution to support the optimization processes must be identified and implemented. The article gathers data on how each specialized department in the mine develops, classifies information, and builds algorithms to extract outcomes based on the department's responsibilities and functions. The study focuses on the Mong Duong mine. As a result, the director has more information to make timely judgments. The language installer is written in C++ and is free source. This improves job performance, .assists employees in retrieving data for work, and reduces manual labor.