Mine Development And Mining Methods - Study Mode

[#151] What is the term for a horizontal underground opening made at the lowest level to drain water?
Correct Answer

(D) Drainage adit

Explanation

Solution: Drainage adit is a horizontal tunnel designed to remove water via gravity.The correct answer is: Drainage aditEspecially common in older mines to reduce pumping needs.Positioned below the lowest active level.

[#152] Which of these stoping methods involves leaving horizontal pillars to support the roof?
Correct Answer

(B) Room and pillar

Explanation

Solution: Room and pillar leaves ore pillars behind to support the roof.The correct answer is: Room and pillarUsed for flat-lying deposits like coal and potash.Room extraction can be partial or full.

[#153] What is the key benefit of sublevel stoping?
Correct Answer

(C) Fast production rates

Explanation

Solution: Sublevel stoping uses multiple drilling levels and longhole blasting.The correct answer is: Fast production ratesSuitable for steep, competent ore bodies.Efficient but less selective and has moderate dilution.

[#154] What is a typical application of raise boring?
Correct Answer

(C) Creating smooth vertical holes

Explanation

Solution: Raise boring drills a small pilot hole, then enlarges it to full diameter.The correct answer is: Creating smooth vertical holesUsed for ventilation shafts, ore passes, and service holes.Safer and faster than conventional raises.

[#155] Which method involves ore fragmentation mainly by gravity?
Correct Answer

(C) Block caving

Explanation

Solution: Block caving undermines a large ore block, causing it to collapse under its own weight.The correct answer is: Block cavingMinimal drilling and blasting once caving begins.Low cost per ton but high dilution.