By interpolating between sample points, this method is similar to contouring the map to display trends, and provides the user with an instant understanding of the relationship between the samples. To compare the relationship between gold values and silver values requires further data to be plotted as shown below.

This map contains the silver values plotted next to the sample location over the gold thematic map. Once again the realtionship between between the silver values and between silver and gold values is not immediately clear. The next map helps clarify these realtionships.