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Answer :
Open-pit mining is the surface mining technique where machines dig holes to remove ores, sand, gravel, and stone near the Earth's surface, making it suitable for extracting resources like iron, copper, coal, and stone. So, the correct answer is option d) Open-pit mining.
The type of surface mining in which machines dig holes and remove ores (such as iron and copper), sand, gravel, and stone (such as limestone and marble) is known as open-pit mining. This method involves digging a terraced hole in the ground to remove near-surface ore bodies, and is commonly used for mining coal and copper. After the overlying rock is blasted, the valuable minerals are loaded onto trucks and taken for further refining. Open-pit mining is preferred when mineral deposits are located close to the Earth's surface.
So, the correct answer is option d) Open-pit mining.
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