Mine Development And Mining Methods - Study Mode

[#231] What is the main disadvantage of shrinkage stoping?
Correct Answer

(B) Delayed ore recovery

Explanation

Solution: Shrinkage stoping leaves broken ore in place to support walls during mining.The correct answer is: Delayed ore recoveryOre is only removed after stope completion, delaying revenue.It's not ideal for high cash flow operations.

[#232] Which of the following is most often used for initial ore body access in steep terrain?
Correct Answer

(D) Adit

Explanation

Solution: Adit is a horizontal tunnel driven from the hillside.The correct answer is: AditIt provides easy and cost-effective access in mountainous areas.Also aids in drainage and early exploration.

[#233] Which method uses "slices" mined from the top downward?
Correct Answer

(C) Top slicing

Explanation

Solution: Top slicing removes horizontal ore slices from the top down.The correct answer is: Top slicingAfter each slice, caved waste fills the void.Used in weak ore and rock conditions.

[#234] What is the purpose of a muck bay in a mine development heading?
Correct Answer

(C) Store blasted rock

Explanation

Solution: Muck bay is a widened section for temporary storage of blasted rock (muck).The correct answer is: Store blasted rockIt prevents production delays during loading cycles.Also used to ease traffic flow.

[#235] What does the term "ore dilution" refer to?
Correct Answer

(B) Entry of waste material during mining

Explanation

Solution: Ore dilution is when waste rock is mixed with ore during extraction.The correct answer is: Entry of waste material during miningThis lowers the grade and increases processing cost.Minimizing dilution is key to profitability.