ABSTRACT..........

 Maddhapara Granite Mining Company Limited (MGMCL) & Barapukuria Coal Mining Company (BCMC)

To explore rock from Maddhapara Granite Mining Company Limited (MGMCL), using the room and pillar method from top to bottom. Mining of hardrock from the lowest strata in the immediate roof and propagates upward into the Dupi Tila formation and up to the base of lower Gondwana group.The roofs of stopes 1-3 in three levels and their loading drifts in production level are quite strong enough to be self-supported while the same in the southern stopes i.e., stopes 4-5 are comparatively weaker. Some of the weaker places have already been supported with bolts and wire-meshes and some are detected to be supported. . Some places in the southern part of mining are weaker and fractured/ fissured. The weakest roofs and points have already been supported with bolts and wire-meshes to continue the mining method properly. Structure and geophysical evulation of the area indicates that the basement complex of the (MGMCL) site is at a raised position from its surroundings. Towards south it has a very steep gradient and is beyond drilling depth at Hinge Zone and to the north it gradually slopes down.

To extract coal from Barapukuria Coal Mining Company (BCMC) using the method of Inclined Slicing Roof Caving Long Wall Mining along the Strike, and the sequence of slices mining from top to bottom. Mining of 1101 coal face initiates caving from the lowest strata in the immediate roof and propagates upward into the Gondwana Formation and up to the base of lower Dupi Tila. The redistribution of stresses analyze by the Peng (1986) and Wilson (1981) method, and the result shows that the stresses are relatively large; of which affect the surrounding rock mass and the next slice solid coal measure. The main concern of caving process relating to subsidence occurrence at the ground surface of the BCMC site is the development of subsidence troughs. By applying NBC (England, 1975) method, it is estimated that at around 0.75 m ground subsidence may occur for the mining of 1st face, and successively for the mining of 5th slice the  ground subsidence may 2.25 m occur, of which is relatively difficult to control the ground response and a violent  interaction effects may anticipated. Filling process can not eliminate subsidence but reduce it if the operation is carried out to a higher standard and to allow an increase in the percentage of recovery of the coal over the caving mining methods. The hydraulic filling materials can reduce the  effects of subsidence at around 8% from its total caving of 30% in a non filling condition, also the degree of curvature on the subsidence profile and consequently result in a reduction of tensile and compressive strain on the ground surface. However it is recognized that implication of hydraulic filling operation may eventually necessary to control strata movements and reducing of mining problems may arise from multi level mining conditions in the very thick seam like Barapukuria condition. Again, such a high risk mining methods must be avoided because failure of the project would be totally unacceptable for economic, political and social grounds of the country. Its failure would seriously jeopardize any future mining prospects in the country.

This mining methods guideline and provide an integrated tool for future the room and pillar method and long-wall planning and design of the mine .This methods also help in extracting other natural resource