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Good day - I want to determine the sample size needed for a run-of-mine. I want to determine the sample mass needed by particle size. I've created a tool determining the variance between the size fractions for the RoM PSD, and then based on that, and with a 10% relative error, how many kg of sample is needed per size fraction for the sample to be representative. However, I don't think it's correct. Does anybody have advise/tool they use to perform a similar exercise?