Question

Which one of the following is the most widely used method for coal extraction in surface mines?

• A. Glory hole mining
• B. Strip mining
• C. Block caving
• D. Cut and fill mining

Hint:

For shallow coal seams spread over large areas, {strip mining} is the most economical and commonly adopted method.

Answer 1

The Correct Option is B

Step 1: Understanding surface mining methods.
Surface mining methods are used when coal seams are located close to the earth’s surface. These methods involve removal of overburden to expose the coal seam for extraction.
Step 2: Understanding strip mining.
Strip mining is a surface mining method in which overburden is removed in long strips to expose coal seams. After coal extraction, the overburden is often placed back into the mined-out area. This method is highly mechanized and economical for shallow coal deposits.
Step 3: Analysis of the given options.
(A) Glory hole mining: Used mainly for steeply dipping ore bodies, not commonly for coal.
(B) Strip mining: Correct — it is the most widely used surface mining method for coal extraction.
(C) Block caving: An underground mining method, not suitable for surface coal mining.
(D) Cut and fill mining: Also an underground mining method used for hard rock deposits.
Step 4: Conclusion.
Since coal seams are often shallow and extensive, strip mining is the most widely used method for coal extraction in surface mines.