Abstarct: The slope stability issue for each mine, both in term of stability and economical constituted important part of the design. Today appearance of enormous size and power machinery in open pit mine was contained high capacity that caused more than resource changed to mineral available for extraction and decrease cut off grade of mineral to a minimum. Due to increased economic growth rate and demand for mineral, many mines that were at or near earth's surface extracted and now the reservation are relatively deep being designed. While there was not possibility of extraction those a few years ago, hence the slope stability both in the design, either in mining or failure to predict is very important. In part of designing from economical, high slope caused decreased stripping ratio, reducing payback period and to increase mineral extracted. The extraction process also provides the possibility of slope stability of multiple explosion and full crushing rock to be desired. In terms of safety in the design phase, in the extraction, mining slope stability, causing better control of surface water and groundwater, designing and creating safety walls in the wall of the mine. The stable slope rate of risk or in other word, risk of loss of minerals, equipment and injury to personnel is minimized, and therefore more economically and safety aspect, will be more secure. The other side, engineering slope's surface is part of the Geotechnical issues that so much uncertainty is ruled. Most of the effects of uncertainty on the predicted stability of slopes are remarkable. In the final methods (Limit equilibration…) stability analysis was just baxsed on safety factor and this method are not able to determine the effect of uncertainties. Probabilistic analysis of the stability of slopes, the perfect tool to take utilization of uncertainties in their design processes. In this study, we tried to introduce a variety of uncertainties in the estimation of the Geotechnical parameters, the principles of probability conventional methods such as Monte Carlo simulation approach that as one of Probabilistic methods to reduce the uncertainties of Geotechnical parameters were introduced recently are widely used. Also, using Slide Software and chose limit equilibrium Bishop as a function, Monte Carlo probabilistic analysis on the walls of the mines studied (Farshamy front of first and second, Gharsaleh front) Zarmehr gold mine and values reliability and failure probability factor was calculated for each mine. Then intensity occurred of the consequences due to the geometry of the pit and some statistical data collected in the pit, was determined by multiplying the probability of occurrence and intensity occurred of the consequences, a number of risks calculated. In Farshamy mine front of first and second, with acceptable risk and the need to act not control, but Gharsaleh mine has been not acceptable risk that must reduced risk due to increase safety. With control action, such as water drainage in the floor pit, sew up part of the laxyers and the redesign of the walls, the re-analysis on the wall of the Gharsaleh that caused a safety factor of approximately 1.5 and the probability of failure from 50% to 20% and the risk is considerably reduced and the level of acceptable risk to be exposed.