Well by my best Judgement the holding areas appears to be 7...

Well by my best Judgement the holding areas appears to be 7 Acres

So your dirt is approximately the same volume as 3 Capitol towers. , According to Wikipedia, acre is 43,560 square feet. So, if you dig 1 foot deep over an acre, you get 43,560 cubic feet of dirt.

So if we reverse that and go by what a tip truck would dump would be 8 foot high so lets just say 6 foot high so that 6 x 43560 cubic feet per acre =  261360 cubic feet then x7  for the acre

= 1829520 cubic feet of material ready to process


The 7 acre paddock was cleared and compacted then a skim of gravel over it with the intention of using it for the stockpile
We already know what the Processing plant looks like
Will make interesting pics