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Answer :
Final answer:
The construction and use of a subsurface mine are more profitable than an open-pit mine when the minerals being extracted are of higher value and concentrated in small, deep deposits. Surface mining is not feasible for deeper deposits, making underground extraction more favorable. Therefore, factors such as mineral value and deposit depth play critical roles in this determination.
Explanation:
Understanding Subsurface and Open-Pit Mining
The choice between subsurface mining and open-pit mining is heavily influenced by the nature of the mineral deposits. A subsurface mine can be more profitable than an open-pit mine in specific circumstances. One significant factor is if minerals being extracted are more valuable in the subsurface mine because of their high purity or concentration.
Open-pit mining typically involves removing a large amount of overburden, which can be cost-prohibitive if the deposit is deeper or less concentrated. In contrast, subsurface mining allows access to high-grade deposits without the extensive removal of surface material, thus preserving some value even before the extraction process begins.
Furthermore, if the required minerals are located at great depths where surface mining is impractical, the depth of deposits will necessitate the use of subsurface methods to recover them economically.
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