Ann: Another Record Month of Gold Production for Blackham, page-180

Value your opinion but i think your figures are out..
Jan was 163kt milled for 6,498oz and the end of the month they had 108kt @ 1.5g/t Au stock piled

Feb, they burned through that 108kt and them some to mill a total of 150kt for 6,713oz and at the end of the month they ended up with 144kt of stock piled ore@ 1.7g/t

As you can see, stock pile and grade has been increasing, they advised grade and stock pile would increase from Jan and it did, they are advising the same for march. I can't vouch for long term but they are defiantly over delivering at the moment.