Question

Match the following

P	Technique	Number	Method
P	Thick seam extraction	1	Double unit face
Q	Bord and Pillar extraction	2	Jet cutting
R	Long wall face development	3	Inclined slicing
S	Hydraulic mining	4	Half moon

• A. P-3, Q-4, R-2, S-1
• B. P-1, Q-4, R-2, S-3
• C. P-3, Q-2, R-1, S-4
• D. P-3, Q-4, R-1, S-2

Hint:

Understanding the specific techniques associated with each mining method helps in selecting the most efficient and safe approach for different geological conditions.

Answer 1

The Correct Option is D

To match the mining methods with their corresponding techniques:
- Thick seam extraction (P) often uses inclined slicing (3) to manage the extraction of thick coal seams in layers.
- Bord and Pillar extraction (Q) is commonly associated with the half moon (4) technique for systematic pillar removal.
- Long wall face development (R) typically involves a double unit face (1) to prepare the face for efficient mining.
- Hydraulic mining (S) uses jet cutting (2), where high-pressure water jets are employed to extract material.
Thus, the correct matching is P-3, Q-4, R-1, S-2.