1275 The procedure has three phases. Phase 1 has three stages: in Stage 1 all historical data is used to perform the probabilistic characterization (statistical and geostatistical); as well as the geochemical characterization, which basically consists of obtaining the corresponding dendrogram, from a multi-element Cluster Analysis. Stage 2 consists of geometallurgical characterization (chemical, mineralogical, textural and physical-mechanical), as explained in paragraph 3. In stage 3, all the information is interpreted and crossreferenced to determine mineralogical-textural assemblages (MTAs). In Phase 2, metallurgical tests are performed on each type of MTAs. In the case of Pucamarca, these were cyanidation column tests; but in other cases, they may be leaching or flotation tests, as appropriate. Finally, in Phase 3, systematic metallurgical logging is carried out, which consists of recording, drill run by drill run, the different types of assemblies determined in Phase 2 (Fig. 5). A similar procedure is applied to determine Geological Fragmentation Units (GFUs), which are geometallurgical units that classify rocks according to their potential response to chemical comminution (blasting) and mechanical comminution (crushing and grinding).
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