(4 to 5 pages essay)Factors affecting choice of mining method_Depth of workings. What are the issues to consider in the

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(4 to 5 pages essay)Factors affecting choice of
mining method_Depth of workings. What are the issues to consider in
the factor_Depth of workings Pillar depth ratio (General set
up_give figures i.e. coal ratio of pillars, case study) Bumps
(why? Remedy? Case study? Surface vs Bord & Pillar mining vs
Wall mining (depth figures?) Longwall 1. Retreat (Gate roads
stresses, What depth? Case study?) 2. Advance (What is the
compromise? Gain? What depth? Case study)