Which of the following mining methods and minerals are NOT related?

Which of the following mining methods and minerals are NOT related?
  • A.
    Open cast mining-bauxite
  • B.
    Dredging-gold
  • C.
    planning-coal
  • D.
    Pumping-petroleum
  • E.
    Placer mining-tin
Correct Answer: Option C
Explanation
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