Optimization of mining boundary in Xieerta open-pit coal mine

The article firstly delineates the basic mining boundary of main mining 2 coal seam, then optimizes north boundary of 2coal seam and determines the 2 coal seam mining scope. Secondly, it discusses what way to mine the east and west block of 3 coal seam and determines 3 coal seam west block open-pit mining and east block underground mining. Finally, it delineates 5 coal seam mining scope below 3 coal seam mining scope and determines the mine open-pit mining boundary.