"... I don't know the answer to that ,... "Maybe some colourful...

"... I don't know the answer to that ,... "

Maybe some colourful accounting can be put to advantage;

Cost of removing and storage of overburden as pure waste, plus management (clerical and accounting) = $X

Benefit (tax offset against operational cost) = $T deduction

DSO sale dynamics;

Income from sale of waste minus management (clerical and accounting) = $Y

The simple equation may look something like; income $In = $Y - $X,

However, now, thanks to a heads-up from unfriendly fire (DF), we may have income looking something like; $In = ($Y+$Td) - $X, instead of $In = $Y - $X, with $Td accrued at a later date and/or in another way.

Putting simple arbitrary numbers to the first looks like $In = ($100 + $10) - $50,
...and the second $In = $100 - $50, shows a possible benefit of $In = $60 NOW instead of just $50 later.

I am not an accountant, but I'll bet HQ are running a ruler over utilising the tax deduction aspect sooner, if they have not already, in an effort to maximise operating capital prior to main production income.