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Identification of rock mass properties in terms of Rock Quality Designation (RQD) plays a significant\udrole in mine planning and design. This study aims to separate the rock mass characterisation based on\udRQD data analysed from 48 boreholes in Kahang Cu-Mo porphyry deposit situated in the central Iran\udutilising RQD-Volume (RQD-V) and RQD-Number (RQD-N) fractal models. The log-log plots for RQD-V\udand RQD-N models show four rock mass populations defined by RQD thresholds of 3.55, 25.12 and\ud89.12% and 10.47, 41.68 and 83.17% respectively which represent very poor, poor, good and excellent\udrocks based on Deere and Miller rock classification. The RQD-V and RQD-N models indicate that the\udexcellent rocks are situated in the NW and central parts of this deposit however, the good rocks are located\udin the most parts of the deposit. The results of validation of the fractal models with the RQD block model\udshow that the RQD-N fractal model of excellent rock quality is better than the RQD-V fractal model of\udthe same rock quality. Correlation between results of the fractal and the geological models illustrates\udthat the excellent rocks are associated with porphyric quartz diorite (PQD) units. The results reveal that\udthere is a multifractal nature in rock characterisation with respect to RQD for the Kahang deposit. The\udproposed fractal model can be intended for the better understanding of the rock quality for purpose of\uddetermination of the final pit slope.The authors are grateful to the National Iranian Copper Industries Co. (NICICO) for their\udpermission to have access to the Kahang deposit dataset. Additionally, the authors would\udlike to thank Mr. Reza Esfahanipour the head of Exploration and Development Department\udof the NICICO for his support.\udThe authors also are hugely thankful to the Institute of Materials, Minerals and Mining\ud(IOM3) for its financial support in order to conduct this research

archives of mining sciences

APPLICATION OF RQD-NUMBER AND RQD-VOLUME MULTIFRACTAL MODELLING TO DELINEATE ROCK MASS CHARACTERISATION IN KAHANG Cu-Mo PORPHYRY DEPOSIT, CENTRAL IRAN / ZASTOSOWANIE METOD MODELOWANIA NUMERYCZNEGO ORAZ MODELOWANIA FRAKTALNEGO DO ANALIZY JAKOŚCI SKAŁ W CELU OKREŚLENIA CHARAKTERYSTYKI GÓROTWORU W OBSZARZE ZŁOŻA Cu-Mo W KAHANG, ŚRODKOWY IRAN