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So then the other metals would be used on the Moon - and then you return the residue to Earth for more processing as a very concentrated source of PGMs and gold.

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Olympic Dam mine - Wikipedia

The Olympic Dam mine is a large poly-metallic underground mine located in South Australia, 550 km NNW of Adelaide.It is the fourth largest copper deposit and the largest known single deposit of uranium in the world, although copper is the largest contributor to total revenue.

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Underground mining (hard rock) - Wikipedia

Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds or rubies.

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"Demandite" is the word used by mineral economists to describe the materials that must be provided— usually by mining— to meet the needs of civilization.

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