Mine Development And Mining Methods - Study Mode

[#51] What is a major limitation of room and pillar mining?
Correct Answer

(C) Pillar design complexity

Explanation

Solution: Room and pillar mining leaves pillars behind, which must be carefully designed.The correct answer is: Pillar design complexityIncorrect design may lead to collapse or excessive ore loss.Requires geomechanical analysis.

[#52] What is the primary purpose of ventilation raises in underground mines?
Correct Answer

(C) Airflow circulation

Explanation

Solution: Ventilation raises are vertical openings connecting levels to improve air movement.The correct answer is: Airflow circulationThey enable fresh air supply and exhaust of harmful gases.Crucial for mine safety and regulatory compliance.

[#53] What is an advantage of a spiral ramp over a vertical shaft?
Correct Answer

(B) Lower initial capital cost

Explanation

Solution: Spiral ramps are inclined tunnels used for vehicular access.The correct answer is: Lower initial capital costCheaper to construct than shafts, though slower for deep ore bodies.Suited for shallow to moderate depths.

[#54] Which mining method is most suitable for flat-lying, stratified deposits such as coal?
Correct Answer

(B) Longwall mining

Explanation

Solution: Longwall mining involves full extraction of coal panels using shearers.The correct answer is: Longwall miningHighly productive for flat, uniform seams.Roof is allowed to collapse behind.

[#55] What is "advance rate" in the context of tunnel development?
Correct Answer

(B) Distance mined per day

Explanation

Solution: Advance rate measures how fast a tunnel progresses.The correct answer is: Distance mined per dayTypically expressed in meters/day or feet/day.Influenced by rock type, equipment, and method.