These numbers appear to be factually incorrect. TC for zinc are...

These numbers appear to be factually incorrect.

TC for zinc are somewhere around these levels:

- $180 a tonne

- $147 a tonne

"With overseas mine supply recovering in late 2018, however, treatment charges – paid by miners to smelters to process ore into refined metal – have now reached $180 a tonne, the highest since December 2015" https://www.brecorder.com/2019/01/11/465027/china-2018-zinc-output-down-4-6-pc-biggest-drop-in-5-years/

"The 2018 benchmark TC/RC reportedly settled at $147/mt, down from $172/mt in 2017, amid still tight concentrates supply." - https://www.spglobal.com/platts/en/market-insights/latest-news/metals/012319-zinc-tc-rc-benchmark-to-rise-in-2019-on-supply-resurgence-analysts