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This is the documentary from the BBC World Service.
I'm Robin Markwell in Chile, exploring the country's relationship with the red metal copper.
You're about to hear the story of a vast hole in the ground.
A hole so big you can see it from space.
A hole that was once a mountain.
I'm standing at the edge of an abyss.
I'm being very careful where my feet are right now because were I to fall from here,
I would fall one kilometre.
That is how deep.
this enormous crater is.
It's the world's largest open-pit mine.
It's called Chukikumata, and it's in the north of Chile, in the Atacama Desert.
The sun is beating down here.
There's a bright blue sky above.
And beneath where I'm standing, I can see white, wispy clouds.