This is a GEOCHEMICAL TECHNIQUE.
Geologists collect samples from the streams/rivers etc. They are analysed to measure the concentrations of metals. The researchers then make their was up stream or downstream, whichever way the concentrations get higher, to find the metal source.
DILUTION occurs downstream due to the gradual addition of sediment which does not contain the metal ore.
CATASTROPHIC DILUTION occurs where tributaries meet.
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