http://www.scientificamerican.com/
The ocean floor teems with mineral treasures, but extracting them could jeopardize an unexplored alien world
People have been clawing valuable minerals like iron and gold out of the ground for millennia. And for much of the stuff that touches our lives today — from the europium, terbium and yttrium that help illuminate the screen you are reading to the copper in the wires that power it— we increasingly depend on elements from the depths of the Earth. But finding new deposits gets harder every year and mines are steadily growing larger, more expensive and more environmentally destructive.
On land, that is. By some estimates the ocean floor has the planet’s largest resources of minerals such as copper, nickel and cobalt. The deep sea also holds gold, silver, platinum and the rare earth elements used in high-tech devices and renewable-energy technology including iPhone displays, solar panels and magnets used in hybrid cars.
Underwater deposits often have much higher grades of ore than those on land, meaning they contain a higher percentage of the desired minerals—in some cases by an order of magnitude or more. The trick is getting the stuff to the surface in a cost-effective way.
Read more