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When mining ore deposits 50 meters or more below ground, which method is usually used?

A. Smelting
B. Placer mining
C. Subsurface mining
D. Surface mining

Answer :

Final answer:

Subsurface mining is the method commonly used when mining ore deposits 50 meters or more below ground.


Explanation:

When mining ore deposits 50 meters or more below ground, subsurface mining is usually used. Subsurface mining involves accessing minerals or ore deposits beneath the Earth's surface through tunnels or shafts. This method is used when the ore is located at a considerable depth and cannot be accessed through surface mining techniques.


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