“It’s like trying to find your way through a maze the size of Earth. These are very long paths that you have to test out, and there’s only one path that works.” To that end, the new Caltec ...

This pit is the most recognizable feature of Kidd Creek Mine, the deepest copper and zinc mine in the world. Below the Earth’s surface, a maze of underground tunnels and shafts pierces 3 kilometers of ...