Mine Development And Mining Methods - Study Mode

[#116] What is the purpose of a refuge chamber in underground mines?
Correct Answer

(C) Emergency shelter

Explanation

Solution: Refuge chamber provides temporary shelter during emergencies like fire or gas leaks.The correct answer is: Emergency shelterIt is equipped with air supply, water, and communication devices.Crucial for miner safety in emergency evacuation plans.

[#117] The term "footwall" in mining refers to:
Correct Answer

(C) Bottom surface below ore body

Explanation

Solution: Footwall is the rock mass beneath the ore body or vein.The correct answer is: Bottom surface below ore bodyThe rock above the ore is called the hanging wall.Important in structural analysis and access planning.

[#118] Which factor is least considered while choosing a shaft location?
Correct Answer

(D) Ore grade

Explanation

Solution: Ore grade is important for economic feasibility, but not a primary consideration for shaft siting.The correct answer is: Ore gradeFactors like geological stability, groundwater, and access are prioritized to ensure safe and cost-effective development.Ore grade influences mining methods, not necessarily shaft position.

[#119] What is a crosscut used for in underground mining?
Correct Answer

(C) Accessing veins perpendicular to drift

Explanation

Solution: Crosscut is a horizontal tunnel driven perpendicular to the main drift.The correct answer is: Accessing veins perpendicular to driftIt provides access to ore zones that are not aligned with the main tunnel.Essential in block caving and vein mining.

[#120] What is the primary support used in weak underground conditions?
Correct Answer

(B) Timber sets

Explanation

Solution: Timber sets are commonly used to support weak or fractured rock.The correct answer is: Timber setsComposed of vertical and horizontal wooden beams, they stabilize tunnels and stopes.Especially useful in narrow vein mines and older operations.