KCCCC, page-23

A couple of years back the grades were consistently falling short and this led to a downward revision of the resource estimate. My understanding was that after that revision, despite some natural minor variation, grades were pretty much on track. Of course this downward revision blew up the original discounted cash flow analysis even more. (pretty much every other assumption in that document blew up also which has led to the massive loss in the shareholders equity that they started with)

However, the quarterly is always obscure so it is hard to really know how well they are going on grades.