Abstarct: Cut and fill is one of the types of underground methods of mineral extraction. In this methode, after the mineral extraction, the cavity created with the filler material is filled to maintain and prevent the demolition of the stops. The drift and filling method is one in which the side tunnels are cave for mineral extraction and filled after extraction. The shape and size of the stope are of great importance in the extractive recovery of minerals. The arc shape of the tunnel stope causes the mineral to remain unexploited and the lose the mineral. The quadrilateral stope has the most recovery in this method but is less stable than the arc stope. Numerical modeling is one of the most important methods in evaluating the sustainability of underground spaces. In this thesis, using FLAC 3D software, the shape and size of the extractive stopes in the Angouran lead and zinc mine were determined. Size for sulfide oxide zone was 5 m wide, 3.4 m high and shape rectangular cross section was determined. For the sulfur zone workshope with a width of 7 meters, height of 3.4 meters and shape rectangular cross section were determined.