your figures look fine not that I would have much of a clue,...

your figures look fine not that I would have much of a clue, think they are on the 1000 drive at the moment the 1080 drive is below.
There is also 13 meters of stoped lower grade ore extracted at the north end of the current drive that may add to the aggregated strike length you calculated. Also I would optimisticly add 10 metres of strike to what you have for what they are mining into at the moment as untill we hear otherwise they are still in the jewellery box, but thats a personal call you probably partially accounted for that by giving 100% recoveries.