Bad cycle, page-13

Sounds like the legal cases I used to read at uni, have to read it 20 times to understand wtf is being said!

Some info on stripping for us laymen (from wiki):

All other factors being equal, mining at a higher stripping ratio is less profitable than mining at a lower stripping ratio because more waste must be moved (at a cost per unit volume) for an equivalent volume of revenue generating ore. If the ratio is too high given a particular price of ore and associated cost of mining then it may not be economical to conduct mining.