The ore mining Tazalaght open pit is risky because of the presence of empty old underground rooms used by the method of long holes without filling and shrinkage stoping. To minimize the risk a multidisciplinary approach has been implemented by the engineering REMINEX Mines and Quarries team and the technical team. The approach began with the compilation and modeling of ancient mining operations followed by a survey by CMS accessible voids followed by a geotechnical study of the deposit which was used to model the zones of influence of voids and dimensioning crown pillars and abutments respect to operate safely. Several cored geotechnical surveys were conducted to explore the empty and unstable areas. Before starting the operation execution plans were developed followed by a detailed study of blasting patterns and monitoring vibration measurements. This work aims to present the different approaches used for the safe operation of the deposit for Tazalaght. These approaches could be of great help to the mining development in Morocco by the re- use of old mines that pose the same risk as the deposit Tassrirt.