Chehel Koureh Copper Mine Project is being executed at a 110 km-distance from Northwest of the city of Zahedan. Because of great orebody depth, underground mining methods will be used to exploit the ore. In this study, geomechanical parameters of rock mass were obtained by means of in-situ tests and empirical formulas. By considering the shape of the mineral reserve and the strength of the rock mass within which the stopes are expected to be created, the non-pillar continuous mining method (NPCM) was selected as the most appropriate method for extracting the ore deposit. Since the rock mass is fractured and has a semi-continuum characteristics, the stability analysis of the stope dimensions was then carried out with FLAC3D software. In the proposed method, a cylindrical pillar with a height of 3.8 meters is located above the stope. For the safety of the drilling room and the stope roof, high sensitivity has been placed on the stability of this pillar. Five different pillar diameters (i.e. 3, 3.2, 3.4, 3.6 and 3.8 m) were analyzed by considering the critical height and plastic zone created around a pillar. For these five diameters, only the pillar with a diameter of 3 meters had a supercritical height. Then for three diameters, the existence of a plastic zone around the pillar was analyzed. It was observed that around the pillar with a diameter of 3.8 meters no plastic zone is created and the safety factor for this pillar obtained 1.11. Due to the limitations for the application of the proposed mining method i.e. NPCM in Iran, Miami method is described as the alternative mining method applicable in Chehel Koureh copper deposit and suitable dimensions for stope and pillar were then determined by the same software. In Miami method, there are three spans and two pillars at each stope before the recovery of pillars can be undertaken. The width of these pillars in three cases i.e. 5, 6 and 8 meters were studied for stability analysis. The analysis showed that around the pillar with a width of 8 meters, no plastic zone was created and the safety factor for this pillar obtained 1.58. Determination of the safety of the pillar recovery operations in Miami method was performed by using PR-Risk (Risk of Pillar Recovery) indicator. The risk value obtained for the pillar recovery operations was 53.3. According to the PR-Risk justify; LINE-HEIGHT: 80%; MARGIN: 0cm 0cm 0pt" Keywords: Chehel Koureh copper deposit; Non-pillar continuous mining method; Miami method mining; Plastic zone; Risk of pillar recovery