For all the doom and gloom about the future of coal, the past two years have been a boom time for coal prices that's exceeded by their 2010 to 2012 peak.
Uniquely among its peers, Glencore derives a substantial slice of its earnings from trading commodities, rather than producing them.
The seeds of Tuesday's 4.6 percent copper slump -- the sharpest in almost three years -- were planted in a scarcely noted non-event earlier this month.
Some companies are good at takeovers. Rio Tinto Group isn't one of them.