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What is the term for a horizontal underground opening made at the lowest level to drain water?

A. Crown pillar

B. Main haulage level

C. Pump chamber

D. Drainage adit

Answer: Option D

Solution (By Examveda Team)

Drainage adit is a horizontal tunnel designed to remove water via gravity.The correct answer is: Drainage aditEspecially common in older mines to reduce pumping needs.Positioned below the lowest active level.

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