I agree with Jon. 0.1g per is just a rough estimate. By the piece, a variation of =/- 0.05g per would be a huge difference on 30K parts. It would be best to pay for a professional assay. If you just send a batch to a "good" or "great" refiner, keep in mind that all refiners will achieve different outcomes due to variations in equipment used, chemicals used, process used and even atmospheric pressure can change results.