Golden Minerals Company

I spoke with the folks at Penntrade, and it sounds like depositing my ECU certificate in an account with them is the simplest solution for me. They charge a fee of $100 to deposit a foreign certificate, but at least the shares will be tradeable, and they will take care of tendering the shares if the merger goes through.

I suspect that most brokers that would accept this certificate would charge a fee like this, in any case.