"interesting that they are going for new 3.5m x 3.5m drive...

"interesting that they are going for new 3.5m x 3.5m drive development at the 640m level and a new portal as the current underground development is ridiculously small for current mining equipment.'

According the appedices in the feasibility study the minimum mining width is 2 meters and the stopes are 2 M wide , and 15M between levels (floor to floor) .
I agree with their logic to keep widths as practically narrow as possible given the seams are as narrow as 10 cm , so reducing dilution would have been nice to know the average width I am guessing 30 cm average given I think i read the maximum is around 70cm .
And of course a 3.5* 3.5 drive means less than half as much rock needs to be handled per linear meter compared with a 5.5* 5.0 meter drive
WIll be interesting what specialised machinery (jumbos) they will use for such narrow crosscuts and drives , seems like there will still be plenty of dilution if 15M between levels