Hammer,
When we were at the mill in Feb. 2009, we discussed buyers for the concentrate with MD. He said they had been in discussions with several buyers and were not locking into anyone at that time. The price of copper was low and they wanted the flexibility to get the best price on the market when they are ready to sell. He stated that selling the concentrate is not an issue. For what it's worth, I believed him.
He did state (on Feb. 5, 2009) that the concentrate would probably go to Hayden, AZ, and if not there, then to China. He said he gets calls on a regular basis from buyers in China about selling to them.
Now keep in mind that this was a few months ago. But with the demand for copper increasing, I don't beleive that obtaining a buyer for the concentrate will be a concern.
FFF