Seems grades went up A LOTFrom CEO.ca forum:
"My interpretation is that the 2.16 g/t tailings would be substituted for the 1.13 g/t tailings number in the Jan. 10 PR. This raises overall grade by 1.03 g/t to 2.91 g/t. That is quite a significant increase."
That's about a 50% increase in grades than what I have been using for my calcs!