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Sample selection

Representivity is defined by Transmin as:

“The extent to which the sample displays the same characteristics as the resource it represents in the test the sample is intended for.”

For example, comminution samples are representative if they have the same abrasion, competency, and hardness as the rock they represent.

Flotation samples, on the other hand, should display the same pay-metal recovery and product grades, grades, and selectivities of impurities and reagent consumption rates.

For resource estimation, environmental and geotechnical tests, different factors should be considered.

If a population has a completely homogenous population, then it does not matter what is taken as a sample as any sample will give the same results as any other.

On the other hand, if the population gives completely random and varied results, then a large sample will be required in order for the sample to be representative.