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Answer :
Final answer:
Subsurface mining involves extracting ore through tunnels and shafts using continuous mining machines. This method is necessary for accessing deeper deposits that cannot be economically removed by surface mining techniques. The other options listed refer to surface mining methods or are unrelated to mining altogether.
Explanation:
Understanding Subsurface Mining
Subsurface mining, also known as deep mining, is a method employed to extract ores located deep beneath the Earth's surface. This technique contrasts with surface mining, where ores near the surface can be removed more easily. To access these deeper deposits, miners utilize a system of tunnels and shafts, which are often hundreds to thousands of feet underground.
One of the methods used in subsurface mining involves:
- Using tunnels and shafts, employing continuous mining machines - This process includes creating extensive networks of tunnels to access the ore, where large machines dig out the mineral from the surrounding rock. These machines can operate continuously, allowing for efficient extraction.
A comparison of other methods:
- Digging very large and shallow open pits refers to surface mining, not subsurface mining.
- Using a bulldozer to remove a strip of soil is also related to surface mining techniques like strip mining.
- Advanced irrigation techniques are not applicable in the context of mining.
Thus, the correct answer to how you get ore through subsurface mining is through tunnels and shafts, using continuous mining machines.
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