Mine Development And Mining Methods - Study Mode

[#111] What is the purpose of a "grizzly" in an underground loading system?
Correct Answer

(C) Sizing oversized material

Explanation

Solution: Grizzly is a coarse screen at ore passes or chutes to block oversized material.The correct answer is: Sizing oversized materialPrevents large boulders from jamming crushers or loading equipment.Improves downstream efficiency.

[#112] What is the most suitable mining method for narrow, high-grade veins?
Correct Answer

(C) Shrinkage Stoping

Explanation

Solution: Shrinkage Stoping is ideal for steep, narrow, high-grade ore bodies.The correct answer is: Shrinkage StopingBroken ore supports the stope walls and is removed later.Reduces dilution in narrow vein conditions.

[#113] What is the function of a mine ladderway?
Correct Answer

(C) Personnel movement

Explanation

Solution: Ladderway is a vertical or inclined passage fitted with ladders for worker movement.The correct answer is: Personnel movementUsed in emergency escape routes or where hoisting is unavailable.Not suitable for haulage or ventilation.

[#114] What term describes the vertical distance between levels in underground mines?
Correct Answer

(D) Vertical interval

Explanation

Solution: Vertical interval is the distance between successive levels.The correct answer is: Vertical intervalIt affects haulage cost, ventilation, and stope design.Common values range from 30 to 60 meters depending on method.

[#115] What does the term "overbreak" refer to in tunnel development?
Correct Answer

(B) Excess rock excavation beyond design limits

Explanation

Solution: Overbreak is unintentional excavation beyond the tunnel design profile.The correct answer is: Excess rock excavation beyond design limitsIt leads to extra ground support costs and instability.Caused by over-blasting or weak rock zones.