Gold Certified Reference Material, G315-9, 1.02ppm, 1KG.
50 gram Fire Assay
Gold Grade 1.02 ppm
Standard Deviation 0.04 ppm
Confidence Interval +/- 0.005 ppm
Aqua Regia Digest
Gold Grade 1.00 ppm
Standard Deviation 0.05 ppm
Confidence Interval +/- 0.013 ppm
Geostats, Australia.