Ho Dung limestone exploitation project is set up by Vo Noi Joint stock company in Dong Tan commune, Huu Lung district, Lang Son province. Limestone exploitation has been causing negative impacts on the environment. The results of the environmental impact auditing showed the actual negative impacts on natural environment such as water, air, landscape and the living environment quality of local people and workers in the region. Before starting the exploitation activities, the project manager has established an environmental impact assessment (EIA) report. However, apart from some impacts identified in the EIA report, several impacts which has not yet been forecasted or occured during project implementation stage due to poor performance of mitigation measures were also studied in this research. The results show that air environment in the residential area has been affected by the mining activities and was polluted by dust; the workers had symptoms of some occupational diseases such as sore eyes, sore throat and earache. Based on the auditing results, the paper also presents some limitation and their root causes and proposes some solutions to deal with these limitations.
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