Question

Depending upon the decreasing ability of surrounding rock to store strain energy in underground metal mining methods can be ordered as

• A. Cut and fill stoping, sublevel caving, sublevel open stoping, block caving
• B. Sublevel open stoping, cut and fill stoping, sublevel caving, block caving
• C. Sublevel caving, sublevel open stoping, cut and fill stoping, block caving
• D. Block caving, sublevel caving, sublevel open stoping, cut and fill stoping

Hint:

As rock stability decreases, the preferred methods generally change as \[ \boxed{ \text{Open stoping} \rightarrow \text{Cut-and-fill} \rightarrow \text{Sublevel caving} \rightarrow \text{Block caving}. } \]

Answer 1

The Correct Option is B

Step 1: Recall the stability requirement of mining methods. Different underground mining methods are selected based on the ability of the surrounding rock to store strain energy.

Step 2: Arrange in decreasing order. The correct order is \[ \boxed{ \text{Sublevel open stoping} > \text{Cut and fill stoping} > \text{Sublevel caving} > \text{Block caving}. } \] Thus, \[ \boxed{(B)} \] is the correct answer.