Abstract
The presence of groundwater flow in an underground mine is influenced by the aquifer fractures interconnected to rocks. Permeability testing method is commonly used to estimate the amount of groundwater. However, permeability tests, both in the laboratory and in-situ, are limited and expensive. Meanwhile, rock quality designation (RQD) which is a standard parameter for determining rock mass classification, can be measured rapidly. Therefore, the this study aims to obtain a mathematical permeability value approach with RQD. The RQD values were compared to the previously established mathematical permeability of Snow theory. Lithological samples (40 samples from 6 drill holes) were collected from PT Cibaliung Sumberdaya's underground mining concession, located in Pandeglang Regency, Banten Province, Indonesia. The results showed that the coefficient of determination (R2) for the overall lithology from the comparison between permeability and RQD was 0.42. Meanwhile, the R2 for Porphyritic Andesite (ANDS), Andesitic Flow (PAND), Vein Breccia (VNBR), Vein Crustiform - Colloform (VEIN), Vein Quartz Stocwork (FTVN), and Andesitic Breccia (BRAN) were 0.7046, 0.56, 0.845, 0.651, 0.7403, and 0.726, respectively. In conclusion, the permeability of mathematical calculations with RQD could not be used as a standard method because RQD does not include aperture discontinuity information, where the aperture is the main factor affecting rock mass permeability. Nevertheless, RQD measurement may provide preliminary permeability description.
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