Gold Certified Reference Material, G314-3, 6.7ppm, 1KG.
50 gram Fire Assay
Gold Grade 6.70 ppm
Standard Deviation 0.21 ppm
Confidence Interval +/- 0.031 ppm
Aqua Regia Digest
Gold Grade 6.68 ppm
Standard Deviation 0.32 ppm
Confidence Interval +/- 0.078 ppm
Geostats, Australia.