RE:sampling biasIn order to remove sampling bias properly, core should be marked with a line down the axis and split along that line. Only one side of that line goes in the bag to be analyzed, and the other side of the line stays in the box. A random selection of pieces from either side of the line is inaccurate and very vulnerable to sampling bias (samplers can select the shiny side only, for example).
When core is solid, as many of the photos of core from NFG's property look to be, a clean split down the middle results in proper sampling that removes sampling bias, as long as samplers are doing it properly and quality control is maintained. Sampling problems can arise when the core comes out all broken up. In that case, no line can be drawn in order to sample only one side. All that can be done is to take roughly 50% of the rubble, in which case sampling bias can easily happen (shiny rubble can get picked over dull rubble).
With 9 drills turning and miles of core to be split, quality control may not have been maintained. I imagine it is now, if they continue to use fire assays. Sampling bias will be a non-issue with the new technology.