Longwall Caving in China - The Practice of a New Thick Seam Mining System in China

Wan B, ; Yu H,
Organization: The Australasian Institute of Mining and Metallurgy
Pages: 5
Publication Date: Jan 1, 1991
40 percent of the coal reserves and 40 percent of the ouput of coal in China is of thick coal seams. The sub-level caving in Yangguan has evolved together with the hydraulic supports, to provide recovery rates today of 80 to 85 percent, waste ratios less than 10 percent and daily outputs exceeding 7,000 tonnes. Matching of rate of shearing bottom coal to caving of top coal is most important to achieve "simultaneous" operations. Spontaneous combustion in the goat, gas, including in the goal, and dust, are particular safety hazards which are combatted with various stringent measures.
Full Article Download:
(633 kb)