I think its about time they put a few holes through that waste dump... Who responsible for putting the dump there anyway ??!!
Anyone care to do the tonnage calc assuming :-
750m Wide
900m Long
80m True width ,
Specific Gravity 2.8
750 x 900 x 80 x 2.8 = ??? Tonnes
Only thing is I think the 900m Length will likely turn out to be actually 1.5km ...