Bord Pillar

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The document discusses different methods of coal extraction from underground mines including diagonal, step diagonal, and steep diagonal lines of extraction. It also covers angles of extraction and support systems used for extraction by hand and with longwall mining equipment.

DIAGONAL LINE OF EXTRACTION 45 0 - Angle Of Extraction

STEP DIAGONAL LINE OF EXTRACTION <45 0 - Angle Of Extraction

STEEP DIAGONAL LINE OF EXTRACTION >45 0 - Angle Of Extraction

Longwall; Longwall in coal; Longwall in Hard Rock; Sublevel Caving; Characteristics of the ore body and mining method; Development; Production; Equipments Used; Block Caving, Introduction, Historical evolution of the method, Condition deposit; Principles of the method; Methodology of block caving; Basic issues of geomechanical to the black caving method; Caveability;Mine design Block caving; Fragmentation and extraction control; Subsidence associated; Advantages and Disadvantages of Block Caving

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