What is line of Extraction ?Types and their reasonable Factors !

Line of extraction is the line or plane along which the roof breaks occurs easily when the depillaring or coal pillar are extracted.

Types of line of extraction-

1. Straight line method

2. Digonal line method

3. Step diagonal line of method

4. Steep diagonal line of method

Depending Factors-

1. Nature and behavior of immediate roof

2. Thickness of coal seam

3. Methodology of support system

4. Method of pillar extraction

5. Type of rock in roof (shale, sandstone)

6. Gradient of seam

7. Presence of geological disturbances.