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Je tiefer dieses Bergwerk ist, desto höhere wird jede neu gewonnene Tonne Kupfererz: je mehr Kupfererz pro Monat das Bergwerk produzieren möchte, desto teurer wird jede Tonne Erz: 2000 Meter im Durchmesser und 762 Meter tief: das Kupfererzbergwerk Palabora in Südafrika.
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