I guess they would not have said a target of 2bt @ 60%+ fe unless there was a high likely hood of it being achieved... Generally in W African deposts the high grade stuff is a surface or close to and usually covering a vast amount of itabirite...Such as found with SDL EQX AKI and others. If if they have 2bt of H.grade they may also have a vast amount of 35-50% grade itabirite as well..