Which of the following statements are true regarding open-pit mining?
A) all of the answers listed here
B) as the pit becomes deeper, the diameter of the hole must decrease
C) common technique for extracting low-grade ores
D) has lower operating costs and fewer occupational hazards
E) involves excavating massive volumes of waste materials
Correct Answer:
Verified
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Q11: Which of the following best describes the
Q12: Some minerals are economical to mine at
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Q15: Which of the following statements is true
Q16: What is a mineral resource?
A) any rock
Q17: Mine tailings represent the waste material from
Q18: Ore deposits are randomly located around the
Q20: Which of the following is NOT an
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