The opencast geological conditions analysis and the mining units formation in ore losses and dilution determining is given in dynamic type. The optimum height of immixed rocks triangle on minimum economic damage from losses and dilution criterion is determined. Minimum damage of an enterprise from losses and dilution of one ton of ore that provides minimum producing cost of ore mining is accepted as a criterion of optimum correlation of technological standards of rate of contact areas and standards of losses and dilution of ore.

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.