Mine Development And Mining Methods - Study Mode

[#161] What is the purpose of using shotcrete in underground mines?
Correct Answer

(B) Ground support

Explanation

Solution: Shotcrete is sprayed concrete used to support exposed rock surfaces.The correct answer is: Ground supportIt prevents rock falls and stabilizes tunnel walls and ceilings.Often combined with mesh and bolts.

[#162] Which of the following mining methods is best suited for steeply dipping, narrow ore bodies?
Correct Answer

(C) Shrinkage Stoping

Explanation

Solution: Shrinkage Stoping is ideal for steep and narrow ore zones.The correct answer is: Shrinkage StopingBroken ore is stored in the stope to support walls and later extracted.Longwall is used in flat seams, especially coal.

[#163] What does an ore pass do in underground mining?
Correct Answer

(B) Transports ore to lower levels by gravity

Explanation

Solution: Ore pass is a vertical or inclined passage used to move ore downward.The correct answer is: Transports ore to lower levels by gravityIt increases efficiency by reducing hauling distance.Proper design prevents blockages and wear.

[#164] What is the main hazard during raise development?
Correct Answer

(C) Falling rocks and material

Explanation

Solution: Raise development involves upward excavation, which exposes workers to falling debris.The correct answer is: Falling rocks and materialProper scaling and support are essential to minimize risks.Raise climbers or raise boring machines reduce manual exposure.

[#165] What does "rill stoping" combine in its mining approach?
Correct Answer

(C) Shrinkage stoping with sublevel stoping

Explanation

Solution: Rill stoping uses elements of sublevel and shrinkage stoping.The correct answer is: Shrinkage stoping with sublevel stopingIt allows blasting from lower sublevels while using broken ore for wall support.Suited for moderately dipping ore bodies.