From a macro sence, there has been a lot of 'fear' about a crash in the states... bonds are proportionally related to stocks. Of which bonds are down as well.
USD had fallen (picked up a bit of late) which also puts pressure on stocks... If bears kick in everyone will run and then australia will obviously feel it too. (I wouldnt be surprised if its not a conspiracy theory to cyclically release 'bad news' and profit from it, US dirty politics).
What our little miners should be concerned about is that of supply / demand curve of resources. Not the friggin US economy which as we all know will tip the scales eventually.
As long as China remains strong / India. This is all we should be worried about, to keep the demand up. So lets all watch the LME instead of US.
Copper price is almost at its 5yr high and warehouse is almost at a 5yr low! And yes it is holding up nicely. So regardless of what happens monday/ tuesday MRX is still in a strong position (as with CUL etc)