well you better be ready to back up the truck then. For example, the bulk of McArthur River ore is in small pods of high grade. For example, pod 2 is 100 m long x 20 meters wide and 30-90 meters high. Pod 2 has 220 million pounds. Do some elementary math on the length, width and height of the core area of A2 and you will get to 250 million pounds. Adding in the rest of A2 and A3 takes the total in situ pounds at Arrow to  well over 400 million pounds.