BHP (NYSE: BHP) has filed to reopen its Cerro Colorado copper mine in northern Chile, a restart the company pegs at $1.5 billion and 20 more years of production.

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‍The mine has been dark since late 2023.

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‍It wasn't shut for the usual reasons - not exhausted ore, not weak copper prices. It was shut because BHP lost access to water. Chilean regulators denied its water permit after local communities pushed back, and the operation went into care and maintenance in the Atacama Desert, one of the driest places on earth.

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‍So the number that matters here isn't really the $1.5 billion. It's the pipeline.

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Why water is the whole story

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‍BHP's plan runs treated wastewater through a pipeline of more than 100 km, pulling it from the town of Alto Hospicio to the mine site. No fresh water, no desalination alone - recycled municipal water piped across the desert. The company also says it will lean on leaching technology to stretch what it has.

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‍That's the fix for the exact problem that closed the mine in the first place.

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‍And it tells you where copper mining in Chile is headed. In the north of the country, water is the constraint that decides whether a project lives or dies. The ore has been in the ground for years. Getting permission to process it is the hard part.

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‍A small mine with a big signal

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‍Let's be honest about the scale. Cerro Colorado is not a crown jewel. It opened in 1994, and at its peak it produced only a little over 1% of Chile's copper - a rounding error next to BHP's Escondida, the largest copper mine on the planet, which sits in the same portfolio.

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So why bother reopening it?

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‍Because the site still holds a large body of lower-grade ore, and because copper demand isn't slowing down. Electrification, grid buildout, data centers - all of it runs on copper. A tired mine with 20 years of life left starts to look worth the trouble when the metal it produces is in structural short supply.

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‍Worth noting: BHP is projecting roughly 1,500 jobs during construction and more than 3,000 once the mine is running, which tells you this is a full rebuild, not a light touch-up.

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‍To be sure, this is a filing, not a green light.

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‍BHP has only applied for the environmental permit. It hasn't received it. And this is the same regulatory system that denied the water permit and closed the mine to begin with. The wastewater-pipeline approach is unprecedented for a mining project in the Tarapacá region, which cuts both ways. It's a genuine solution, but it's also untested, and untested plans draw scrutiny.

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‍If you're watching this one, don't watch the copper price. Watch the permit.

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‍That approval is the entire trade. Copper's long-term case is already priced in, and $1.5 billion is a modest line item for a company BHP's size. What isn't settled is whether Chile lets the mine reopen at all. Get a yes, and BHP adds two decades of supply. Get a no, and the ore stays exactly where it's been since 2023 - in the ground.

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