Abstract
MOIL is producing annually around 1.13 million tones of manganese ore. It operates 7 underground and 3 opencast mines in the state of Madhya Pradesh and Maharashtra. The underground mines are operated at shallow to moderate depths. Asia's largest and oldest underground manganese mine is being operated by MOIL at Balaghat, Madhya Pradesh. Horizontal cut and fill mining with passive timber square set support has been replaced with advanced technique of pre-mining support by Cable bolting for reinforcement underground structures. The change in technology has enabled to transform the manual post filling of rock to hydraulic sand stowing operation in all the underground mines of the MOIL. With the available underground stopes, the panel working has been started with phased mechanization. The Side discharge loaders (SDL) has been introduced for mechanical handling of ROM in the stope and Load, haul and dump (LHD) machines for drivage development. These rapid mining operations have imposed the need for change in level interval for higher productivity. Presently below 12th level, level interval has been changed from exiting 30m to 45m at Balaghat Mine. Moreover, Single boomer electro hydrostatic crawler mounted drill jumbo has been introduced for drivage development at Balaghat Mine. The paper describes the phased rock mechanics investigations and its application in the underground mining for mechanized stoping operations at Balaghat mine of MOIL for better safety and productivity.
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