Using a spreadsheet calculation procedure which relates a series of altered rocks back to their appropriate precursor compositions, mass changes are calculated for each element. Mass changes which are due to hot fluids can be recognized, as can those due to cooler fluids -- the former are of greater interest to the explorationist as they are associated with mineralization. The mass changes results, which provide hydrothermal alteration vectors, can be plotted down individual drillholes, and can be contoured on sections to show large-scale alteration trends.

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