Which description matches a horizontal tunnel drilled through a diamond pipe?

• A. Cave Mining
• B. Marine Deposit
• C. Indicator Minerals
• D. Drift

Answer: (D)

A drift is a horizontal underground passage driven into a ore body to provide access for mining along or through the deposit. When a diamond pipe is mined, a horizontal tunnel through the pipe allows workers to reach and extract the diamond-bearing material from inside the pipe, following its length. This matches the description of a horizontal tunnel drilled through a diamond pipe.

Cave mining involves exploiting natural voids or caves, not a planned horizontal tunnel through the pipe. Marine deposits refer to diamonds found in oceanic sediments, which relate to the deposit type, not a tunnel. Indicator minerals are trace minerals used to locate kimberlite but do not describe a tunnel or access method.