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An ore located deep within Earth's crust is removed by __________.

a) Surface mining
b) Placer mining
c) Subsurface mining
d) Hydraulic mining

Answer :

Final answer:

The correct answer is option c) Subsurface mining. Subsurface mining is used to extract ore deep within the Earth's crust, involving the creation of shafts and tunnels. It is less disruptive to the surface but more expensive and dangerous than surface mining methods.

Explanation:

An ore that is located deep within the Earth's crust is removed by subsurface mining. This method involves digging deep shafts and extending tunnels horizontally from the shaft into the ore body to extract the mineral resources. Subsurface mining is contrasted with surface mining methods such as open-pit mining, where the extraction happens at or near the surface of the ground. The deepest subsurface mines can be found in the Witwatersrand basin of South Africa, where gold is mined.

Subsurface mining is considered less disruptive to the land surface and generally creates fewer waste materials compared to surface mining methods. However, it comes with higher costs and increased risks for miners, such as the need for adequate ventilation and lighting in the underground tunnels, and is associated with a higher frequency of accidents.

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