Q69
Which of the following is a disadvantage of longwall mining?
A.
Low productivity
B.
High ore dilution
C.
High initial capital cost
AnswerD.
Poor safety record
Answer: Option C
Solution
Answer: Option C
Solution:
Longwall mining is highly productive, especially for coal.The correct answer is: High initial capital costRequires expensive machinery and roof support systems.However, it offers good safety and recovery rates.