Method for determining reasonable boundary for converting strip mining into underground mining for mine

A method of determining mining from open pit to underground mining reasonable boundaries, calculated in two steps determined: first grade configuration variables and variable costs of reasonable economic stripping ratio and static realm stripping ratio calculation and analysis function; the second step is on the proposed boundaries of the scheme may compare the dynamic economy, the establishment of mining depth of dynamic economic models, considering the time value of investments, profits, and capital throughout the mine life of the mine to optimize the combination of comparing the actual situation on the basis of the first step. The maximum total net present value of the mine with principles derived from open pit to underground mining mines reasonable boundaries. In this way each open pit mine selected to Underground boundaries depth program has a strong filtering capabilities; enable mining enterprises according to the actual situation, choose a number of programs to compare the depth, effectively reducing program selection brought about market risk.