Mine Development and Mining Methods MCQs Questions & Answers | Mining Engineering

Sublevel caving allows ore to be extracted as overlying waste caves in.The correct answer is: Caving of overlying wasteOre is blasted from sublevels, and cave propagates upward.Requires good caveability and ground control.

Block caving relies on gravity to break and extract the ore.The correct answer is: Block cavingThe hanging wall collapses into undercut areas.Used for massive, low-grade bodies.

Definition of Tunnel Advance Rate:
Tunnel advance rate refers to the linear distance a tunnel progresses over a given period of time during excavation. It is a key performance indicator used in tunneling projects to measure the efficiency of excavation methods, equipment, and workforce.

Correct Answer: Option C: m/day
The correct answer is Option C: m/day because the tunnel advance rate is typically expressed as the number of meters excavated per day. This unit provides a direct and practical measure of the speed at which the tunnel face is advancing.

Using meters per day allows engineers, planners, and contractors to:
• Plan construction schedules
• Estimate project duration
• Allocate resources efficiently
• Evaluate the performance of different excavation techniques (e.g., TBM vs. drill-and-blast)

The unit is linear (not volumetric or weight-based) because the focus is on the distance advanced along the tunnel alignment, not the volume or mass of rock removed.

Explanation of Other Options:
Option A: Tons/day
This unit measures material output or removal, not the linear progress of tunneling.

Option B: m³/hour
This unit refers to volume of material excavated per hour and is more commonly used in equipment capacity or production rate assessments, not tunnel advance.

Option D: ft²/min
This is a unit of area per time, which does not represent linear progress or tunnel advancement.

Conclusion:
Therefore, the correct answer is Option C: m/day, as it directly represents the linear rate at which tunnel excavation progresses over time.

Sump is a low point designed to collect and drain water.The correct answer is: Water collection pointOften located at shaft bottoms or tunnel corners.Pumped out to maintain dry conditions.

Room and pillar mining leaves pillars behind, which must be carefully designed.The correct answer is: Pillar design complexityIncorrect design may lead to collapse or excessive ore loss.Requires geomechanical analysis.

Ventilation raises are vertical openings connecting levels to improve air movement.The correct answer is: Airflow circulationThey enable fresh air supply and exhaust of harmful gases.Crucial for mine safety and regulatory compliance.

Spiral ramps are inclined tunnels used for vehicular access.The correct answer is: Lower initial capital costCheaper to construct than shafts, though slower for deep ore bodies.Suited for shallow to moderate depths.

Longwall mining involves full extraction of coal panels using shearers.The correct answer is: Longwall miningHighly productive for flat, uniform seams.Roof is allowed to collapse behind.

Advance rate measures how fast a tunnel progresses.The correct answer is: Distance mined per dayTypically expressed in meters/day or feet/day.Influenced by rock type, equipment, and method.

Passive support does not actively resist deformation but holds ground in place.The correct answer is: Steel setShotcrete and bolts are considered active supports.Steel sets are common in tunnels with poor ground.