@RiC088 I understand ore concentrate of the Tantalum pentoxide...

@RiC088 I understand ore concentrate of the Tantalum pentoxide can vary, concentrates can contain from 13–15 percent (grade 3) to 26 percent (grade 2) and 40 percent (grade 1) Ta₂O₅ and we can only guess what price AT managed to snaffle per kg, but for our guestimating purposes it's around$123 per kg US, which I figure is what you used or thereabouts. Still if they can sell a years production of concentrate it's all good for the bottom line!