As previously mentioned, the initial geological surveys of a deposit result in essentially qualitative information, and any quantitative information will generally be on a non-systematic grid. In general, it is not possible to construct sufficiently representative histograms and variograms on the basis of such information. However, even if it is of a purely qualitative nature (e.g., structural geology) this information can be used during the geostatistical structural analysis, which will later be carried out on the data obtained from the first systematic sampling campaign. The geology is used as a guide in the construction and interpretation of the various experimental variograms. These variograms then channel this geological knowledge into the various studies involved in a mining project.