Abstract

The Kandri underground mine of MOIL Ltd in India at present is spread in four levels i.e. (-) 50'L, (-) 150'L, (-) 250'L and (-) 350'L, with 30 m vertical intervals. Total strike length of Kandri deposit is approx. 600 m, which is divided into North Limb, South Limb, South Limb Extremity. The wide thick ore body encountered in the South Extremity is of great importance to MOIL from recovery point of view. At the same time, method for its recovery is also challenge due to the complex rock mass and geological structure. Since, the orebody in this part is suddenly plunge to 25–30 degrees from the earlier 45–50 degrees. Moreover, the overlying strata are also saturated with water. In the present paper, rock mechanics studies carried out with empirical and numerical approaches applied to derive safe stoping parameters and support system will be presented. In view of the present infrastructure and trained manpower, Room-and-Pillar with post-pillar as a possible method of stoping operation is suggested and discussed herewith. The representative case study from a typical man-entry cut-and-fill stoping environment from the Kandri Mine in MOIL Ltd. is presented to demonstrate how hydraulic sand fill and left out pillars act as a good support measures.

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