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Which mining method uses terraces in very deep holes to extract iron and diamonds?

A. Open-pit mining
B. Subsurface mining
C. Placer mining
D. Solution mining

Answer :

Final answer:

Open-pit mining uses terraces in very deep holes to extract iron and diamonds, and this technique is ideal for minerals located near the surface over a large area (option a).

Explanation:

The mining method that uses terraces in very deep holes to extract resources such as iron and diamonds is known as open-pit mining (A). Open-pit mining involves creating large terraced holes in the earth where miners descend on a series of ramps or levels to extract the target mineral.

This method is typically used when the mineral or ore is located near the surface and is spread out across a large area, making it economically feasible to remove large amounts of overburden (the surface material covering the mineral).

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