The fate of iron ore is key for Vale. The company is sitting on what could turn out to be the biggest reserve of iron ore on the planet and it was found on the edge of Brazil's Amazon forest, by accident. Now, the world's largest iron ore miner is about to flip the switch on a new $14 billion mine and transport corridor aimed at getting some of that windfall to market. Bloomberg News' R.T. Watson reports. (Source: Bloomberg)