Mine Development And Mining Methods - Study Mode

[#146] Which mining method uses a mobile platform to excavate raises?
Correct Answer

(C) Alimak raising

Explanation

Solution: Alimak raising uses a mechanized raise climber to excavate vertical openings.The correct answer is: Alimak raisingAllows work from a safe platform.Common in ventilation and manway raises.

[#147] What is the primary reason for backfilling in underground mining?
Correct Answer

(C) Provide ground support

Explanation

Solution: Backfilling involves placing material in mined-out voids.The correct answer is: Provide ground supportStabilizes surrounding rock and allows nearby mining.May also reduce surface subsidence.

[#148] In which condition is shrinkage stoping most effective?
Correct Answer

(C) Narrow ore body with firm walls

Explanation

Solution: Shrinkage stoping is ideal for narrow, steeply dipping ore bodies with competent rock.The correct answer is: Narrow ore body with firm wallsBroken ore supports walls during stoping.Not suitable for weak ground.

[#149] Which development method is used when fast access to deep ore is needed?
Correct Answer

(C) Vertical shaft sinking

Explanation

Solution: Vertical shaft sinking provides direct, quick access to deep ore zones.The correct answer is: Vertical shaft sinkingFaster than ramps for deep deposits.Used for hoisting, ventilation, and transport.

[#150] What is the role of scaling in underground mining?
Correct Answer

(B) Removing loose rocks

Explanation

Solution: Scaling involves removing loose or dangerous rock from the walls and roof.The correct answer is: Removing loose rocksEssential for safety before personnel or equipment enter.Done manually or mechanically.