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Stretch: Minera Pircahue: where should a copper mine get its water?
The prompt
Minera Pircahue runs a copper mine in the Atacama Desert in northern Chile. It must cut its use of local groundwater by half within three years. Should it cut production, build its own desalination plant, or buy desalinated water?
Your interviewer will share data as you ask for it. Ask clarifying questions, state a hypothesis, then lay out your structure out loud before you calculate.
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