Abstarct: Open pit mines are being extracted at the fastest rate and soon will reach their economical boardess due to these days consumerism at it’s highest. There force, underground mining, which can be the only solution, must be planned before the open pit mines have reached their end. In this project, the lead and zink mine of Angouran, with annual production 120,000 tons, is considered as the case study. Numerical modeling in Matlab software has been taken into account for this project. After soluing the matter at hard, it was clear that the production can be almostdoubled to 220,000 tons by adapting the mine forces and increasing baching and concreting. Moreover, it is worth to mention that this expansion and development is planned for a period of two months, therefore more efficient extraction to the mines highest potential is achievable in longer periods.