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An open-cut mine is more cost affective because you don't need as much equipment and explosives that a mine under ground.

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Q: Why is an open cut mine more cost effective?
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Why are copper mines operated on a large scale?

Usually the copper deposits are large, or located far beneath the topsoil. Thus, the most cost effective way to mine copper generally is in a large open pit mine.

Is gold expensive to mine?

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What are the similarities between quarrying and mining?

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