From a technical perspective there is a double top in price in the US Dollar index.
This shows up well on the weekly chart perspective. From my experience, the longer the perspective the more true the indicator in question.
Some of the great trades are made in the big moves in commodities prices and the US Dollar is the ultimate commodity.
There is the possibility of a dramatic fall, on a weekly perspective, with a break through the 'neckline' of this price chart. At the least this chart signals a change in sentiment for a strong dollar.
Don't fight the Fed.
VALE is strong.