In order to ensure the representativeness of the sample, the more samples are taken out, the better, but such results are uneconomical and unnecessary. In actual work, always determine the minimum sample quality in a representative beneficiation , what is the sampling, what is the sample, how to determine the minimum mass of the sample. There are many factors affecting the quality of the smallest sample, mainly the maximum block size of the material, the mineral inlay characteristics, the content of valuable components in the material, the difference in the density of each mineral composition, and the allowable error. Currently, the following empirical formula is used to determine the minimum mass of the sample:
Where Q is the minimum mass necessary to ensure the representativeness of the sample, in kilograms;
D——the particle size of the largest nugget (granule) in the sample, in millimeters;
Coefficient K-- properties associated with the ore, in addition to the noble metal, usually between 0.02 to 0.5, most commonly from 0.1 to 0.2.
If the sampling method is correct and the sampling system is reasonable, the minimum mass of the sample calculated according to formula (10-1) can represent the nature of the whole raw material. The amount of sample for chemical analysis is generally several grams to one kilogram, and the amount of sample for the ore dressing test requires several kilograms to several tons.
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