The study area may be affected by the mining activities in terms of groundwater quantity and quality. A mathematical groundwater model, so-called Visual MODFLOW, is one of the effective tools to explain groundwater flow direction and groundwater storage in the complicated groundwater system. The objective of this study mainly focus on groundwater quantity by explaining groundwater flow around Chatree gold mine. The observed groundwater data was mainly derived from the Department of Groundwater Resources (DGR) during 2010 – 2011. The groundwater flow modeling was calibrated and then verified with measured groundwater levels in both the steady and transient states with RMS ranging from 4.097 – 8.269 m. According to the calibration and verification results, the main groundwater aquifers, volcanic fractured rock aquifer (Vf), has the highest hydraulic conductivity (K) of 2.06E-05 m/s. The specific storage in these aquifers ranged from 5.00E-06 to 2.38E-04 1/m with an average of 6.85E-05 1/m. The results showed that main direction is oriented in the Northeastern - Southwestern direction. Recharge can be classified into 3 zones based on geological characteristics and is the most sensitive parameter for this model. Also, hydraulic conductivity in the layer 1 (Qfd&Qt) is the most effective as compared to those in other layers. Finally, the layer 3 (Vf) is the most losing water from pumping well at a rate of 1,663.2 m3/day.
