Still trying to piece together these discrepancies between...

Still trying to piece together these discrepancies between historical sampling results and the latest results of 2014. How could they differ so much? I note the report talks about the potential harm of 50 years of weathering but still, there are some huge differences there. Hoping EQU's only sampling program works out on the higher end of the scale but still 0.25% Co is still great compared to some Co hopefuls out there.