Ideas for interpreting the questions behind materials and laboratory reports.
← Back to insightsHow variability, collection and preparation shape the meaning of an analysis.
Material is rarely uniform
A mineral-bearing body may change over short distances. Even a small pile of crushed material can contain particles with sharply different compositions. What is observed in one hand specimen cannot automatically be extended to every part of the source.
A useful assay question therefore starts with the target population: a single rock, a sample bag, a stockpile or material from a defined collection interval. Different targets call for different sampling approaches.
Representative does not mean simply large
Increasing sample mass can help in some circumstances, but size is not the only consideration. The number and distribution of collection points, particle size, mixing and splitting can each affect the sample’s usefulness.
Preparation should preserve the relationship between the material received and the test portion ultimately examined. Correct identification through crushing, mixing and sub-sampling reduces avoidable ambiguity.
Reading a mineral result
A concentration value is linked to the test portion and relevant measurement method. Units, reporting limits and the suite of elements examined influence what can be concluded.
A result may be technically precise while still being a poor description of the intended batch if the original sample was biased. When applying data to exploration or commerce, analytical evidence should be paired with a defensible sampling plan.