Assertion: rich ore | /r/CapableOf | become depleted
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Source sentences:
text: As nickel-rich ores at Norilsk Nickel become depleted, Norilsk Nickel will switch to mining larger quantities of ores, which will be primarily copper-rich ores that have a higher copper content relative to their nickel content than the nickel-rich ores, but are lower in metal content for both metals.