Determination of Safe Pillars Size at Ingassana Chromite Mines - Sudan

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El Tahir, Ahmed Gaafar
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University of Khartoum
The aim of the present thesis is to study and treat the cases of failures which occur in Ingassana chromite mines (Sudan) using room and pillar method and to determine the safe dimensions of rooms and pillar in order to have the maximum and safely extraction ratio. Two computer programs (Finite element and ARMPS) are employed to design the room – pillar method for various ore minerals, and redesign the room-pillar method which being used in Ingassana Mines. Also the room-pillar method of Kung mine (Ingassana chromite mines) is redesigned and the displacements are determined. The dimensions of pillars were reduced (length, width however, the heights of the pillars kept constant) and the width of rooms increased resulting the extraction ratio about 14 % with the safety factor 1.6 (the minimum safety factor for chromite ore) All pillars in the suggested design will have square cross section (shape) instead of rectangular. The stress and strength at the pillars are directly proportional to the distance between the pillar and the cross sectional area of the pillars, inversely proportional to the heights of the pillars. The effect of overburden depth will be neglected at depths less than 50 m however will remain safe at depths less than 400 m. The few examples of application of finite element method show its wide applicability and indeed its characteristics which make it particularly suitable analysis tool in the field of mining
Determination,Safe,Pillars,Size,Ingassana Chromite Mines,Sudan