one final thought on kcl process the companies involved are experts and they have a pretty good idea on whether it s economical or not. they use more or less standard machinery so they can reliably come up with a rough estimate. if they were doubtful NPK could have just said they still trying to optimize 1 or 2 more things with the "engineering group s" help . that would have been a negative . however, instead they set a near date for PEA. isnt it obvious that they believe they got it right !