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

The question asks about the most widely used method for coal extraction in surface mines. Let's evaluate each option:

1. Glory hole mining: This method is not typically used for coal extraction. It involves mining through a crater-like opening, suitable mainly for steeply dipping ore bodies.
2. Strip mining: This is indeed the most widely utilized method for extracting coal from surface mines. It involves stripping away overburden from coal seams, allowing direct access to the seams. This method is efficient for coal deposits situated near the surface.
3. Block caving: This method pertains mostly to underground mining. It involves undermining a mineral body and allowing it to collapse under its own weight. It's not typically used for surface coal mining.
4. Cut and fill mining: This is an underground mining technique used in mineral-rich areas and not suitable for large, surface-area mineral deposits such as coal seams.

Based on the explanations above, the correct answer is Strip mining. This method is specifically designed for mining resources like coal when these are close to the surface, and it maximizes extraction efficiency and safety.