:: Journal of International Environmental Application & Science ::

Year 2008, Volume III (Issue I)

Journal of International Environmental Application and Science , Vol. 3, No. 7 (2008), 57-65

Evaluation of pit lake formation in choghart iron mine of Iran by using simulation approach

Javad Gholamnejad

Department of Mining and Metallurgy Engineering, Yazd University, Yazd, Iran

Abstract: After mine closure, open pit mined can be converted to a pit lake under special circumstances, depending on the slope stability, hydrology, climate conditions and water quality. In Choghart open pit iron mine, pit will be extended approximately 280 meters below the existing water table. With regard to ground water inflow, a lake will be formed after mine closure. In order to evaluate future open pit lake level in Ghoghart open pit, a mass balance model has been developed. Analysis of data gathered from mine site, available reports and literatures showed that pit lake will reach to its final depth of approximately 230 meters from pit bottom and it takes about 17 years after mine closure to reach 82% of its pre-mining elevation. By that time, final volume of water in pit will be about 57x106 m3. Under these conditions, ground water would flow towards the pit lake in all directions and water in the lake would not recharge the aquifer system.

Keywords: Surface mining, environmental assessment, environmental components, impacting factors.