President Trump signed an executive order Thursday that aims to jump-start mining on the ocean floor. Large-scale deep sea mining has never been done — though some companies have pushed for it ...

There is currently no commercial-scale deep-sea mining anywhere in the world. But companies have long eyed the ocean floor as a potential source of metals like nickel, cobalt, manganese and copper ...

There is currently no commercial-scale deep-sea mining anywhere in the world. But companies have long eyed the ocean floor as a potential source of metals like nickel, cobalt, manganese and copper, ...