Variability Study of Bond Work Index and Grindability Index on Various Critical Metal Ores

It is a well-known fact that the value of Bond work index (wi) for given ore varies along with grinding size. In this study, variability bysis carried out standard grindability tests on different critical metal ores (W, Ta), ranging from coarse (rod mills) to fine (ball mills). The relationship between wi and size did not show clear correlation, while (gpr) showed robust fitting in all cases quadratic curve very high regression coefficient. This result suggests that, when performing correlation studies among rock mechanics parameters, it advised use instead index.