Effects of Cost and Price Changing on Final Pit of Open-pit Coal Mine

• 1、Resources and Ecological Economics Research Center, Northeastern University, Shenyang 110004, China.
• 2、China Coal Technology & Engineering Group Corp, Beijing 100013, China.

Abstract：Based on the criterion of economic strapping ration, surface model and columnar seam model, CoalDesign software system was used to optimize the final pit of an open coal mine in the inner Mongolia. Some final pits were obtained under different technical and economic conditions. The case of final pit changing with cost and price was analysed. In practice, taking current technical and economic parameters as benchmark, when the price of raw coal increased by 10%, it resulted in raw coal yield increasing by 7.9%, rock stripping volume increasing by 11.5%, the quaternary layer stripping volume increasing by 6%, the boundary total volume increasing by 9.5% and the profit value increasing by 238% without considering infrastructure investment. When the cost of mining lowered by 10%, it resulted in raw coal yield increasing by 8.4%, rock stripping volume increasing by 12.3%, the quaternary layer stripping volume increasing by 6.5%, the boundary total volume increasing by 10.2% and the profit value increasing by 245% without considering infrastructure investment. The result showed that the final pit is influenced by price and cost greatly. Boundary analyzing had an important reference value to decision maker making good decisions.

Keywords： open- pit coal mine final pit cost price economic stripping ration