A sample taken at random; it is assayed to determine if valuable elements are contained in the rock A grab sample is not intended to be representative of the deposit, and usually the best-looking material is selected
Typically, a single water or air sample drawn over a short time period As a result, the sample is not representative of long-term conditions at the sampling site This type of sampling yields data that provides a snapshot of conditions or concentrations at a particular point in time ADVANCE \x 540