In the Russian Federation, about 40 % of tailings dumps are in operation GOK. The development of mechanized impossible, due to heavy water production, the stability of the dam breach and the possibility of a breakthrough. In this regard, the task of developing the existing tailings dumps will now increase the competitiveness of enterprises and reduce the cost of iron ore concentrate.

The equation to calculate economic damage from losses and dilution of minerals is given in dynamic type. The optimum height of immixed rocks triangle on minimum economic damage from losses and dilution criterion is determined. The equation for determination of the optimum safety berm width when forming the final edge of an open pit is presented.