For rocks and drill cuttings, a lead fire assay method Act Labs actrs104 clearly the superior method to obtain a total gold concentration. The ISO does not look at analytical methods at all, only the quality system. Actlabs :: Activation Labs :: Contract Analytical Services How Do I submit samples to your lab? Please select the market you wish to submit samples to: Just continue. Here the methodologies vary widely with some doing aqua regia digestions in hot water baths[…]