RE: what the ell is going on hereIf volume was heavy the decline in share price would mean something. Since volume is light the move is meaningless.
Zinc is down, superficially down in the sense that the fundamentals that drove the price up all of 2016 remain in place. Trevali's decline is superficial in the same sense.
There are all sorts of explanations available--at Fastmarkets among others--attributing the present decline in zinc as nothing more than traders squaring their year-end books prefering to be unexposed over the holidays. Again, volume is light.
It's hardly 'panic in the streets' or 'blood on the floor' time but opportunities present themselves when they will and this is one of them. Buy!