Special method- Thick seam working by Blasting Gallery
Extraction of seams thicker than four meters has always been a technical problem for the
mining industry in the country as also for SCCL, which has an 8 to 10m thick
coal seam all over its coalfields. Conventional Bord and Pillar development and
depillaring in two sections has resulted in poor recovery & productivity, higher
cost of production & risk to safety.
During the year 1980-81, SCCL looked for specialized technologies being used abroad
for mechanized extraction of thick seams to obtain larger outputs with better
recovery and safety from thick seams. A feasibility report was obtained from
Charbonnages de France (CdF) in 1984 for extracting 8 to 10m thick seams in
GDK-10 incline by “Blasting Gallery technique”.
At present, 5 Blasting Gallery (BG) units are working successfully in GDK 11, GDK
8, GDK-10, Vakilpalli and 21 incline of SCCL.
During 2011-12, the production from BG
method in SCCL was 1.209 MT.