RE:Treatment charge confirmation?no prob. the latest news about it I found is from metalbulletin. TC from September 25 were between 100 and 120 USD, down from 170-190 end of August.
https://www.metalbulletin.com/Article/3953917/Zinc-TCs-down-40-on-LatAm-supply-disruptions-short-covering.html
You have to know though that thats spot TC. The TC prices that are fixed for the whole year in March every year (and relevant for the whole calendar year) are normally a little higher than spot. There were years where spot and yearly TC were equal, but you normally can count about 50 USD more on yearly than on spot.
So Trevali is certainly not going to get 120 TC in March, that d be illusionary. Realistic would be 200 which will reduce production costs 0.10 USD/lb.
As Trevali has stated already, each 10 USD TC equals to 0.01 USD/lb