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I have recently been looking at screen fire assays of core samples containing coarse gold. This seems to be a very difficult process for a project to quality control in terms of duplicates due to the in-homogeneity of the coarse fraction - finer fraction no problem. As far as determining accuracy via Certified Reference Materials, I cannot see how it will be possible to homogenize enough to certify the material within any reasonable limits at the coarse fraction. Only way I can think of is to use several different labs and see if there is any overall bias, but live with the poor precision - any ideas on this approach?