Spectral analysis aids exploration from property to regional scales. Although useful for identifying minerals in individual samples, field spectroscopy is most effective when data are collected in a large-scale, systematic manner. Large-scale surveys carried out on grid or other systematic patterns provide valuable information. For example, in complex zoned intrusive systems the alteration mineralogy determined during routine mapping helps to define the vertical and horizontal zoning and related ore environments. Within each environment the alteration mineralogy can define local zoning, providing vectors to mineralization. Spectral analysis may also provide information on subtle mineralogical and chemical changes even where the dominant mineralogy is obvious to the field geologists. Data processed and evaluated concurrent with mapping can have a direct impact on an exploration program.
Source: A.J.B. Thompson