Gold Certified Reference Material, G921-3, 13.01ppm, 1KG.
50 gram Fire Assay
Gold Grade 13.01 ppm
Standard Deviation 0.40 ppm
Confidence Interval +/- 0.058 ppm
Aqua Regia Digest
Gold Grade 12.87 ppm
Standard Deviation 0.54 ppm
Confidence Interval +/- 0.148 ppm
Geostats, Australia.