The existing landfill at the site "Maljevac" is still active and it should provide the additional space for ash and slag disposal and continue the exploitation period as long as possible. For these purposes, in the licensed GEMS and Minex software, the variant solutions of the dump overtop to the peak elevation K + 832 m were developed in the licensed GEMS and Minex software to see the all possibilities of the "Maljevac" site. Out of the four offered variant solutions, an optimal variant was selected giving the largest disposal space and the least unit costs of exploitation.