Yes, you are right that it is a unit of measurement. But it is a...

Yes, you are right that it is a unit of measurement. But it is a measurement unit for weight not price! That is why when talking about money it is not fully correct to talk about 25kt of LCE when actually 200kt of Spodumene is the product that is being sold. There is no price for LCE and the price for 200kt of spodumene concentrate is a bit lower then the price for 25kt of Lithium Carbonate.

Regarding the amount. I believe that the DFS was based on a processing plant of 1.4mtpa which was later increased to 2mpta (if my notes are correct).