The main purpose of this paper is to analyze the stability of the open coal mine “Suvodol” in Southwest Macedonia, during the past two years (from April 2009 to December 2011), also to represent one new approach for assessment of slope stability of working benches on open coal mines.In the first half of 2009 the open pit mine had an alarming situation where the whole bed moved about 1 cm per day from the Southeast towards to the Northwest so that this situation be conveyed directly in the operation of this mine. To resolve this situation needed further analysis of the stability of the working benches, development of new work plans of method of excavation of coal and overburden in mine and very carefully monitoring the situation on the ground and monitoring the system of cracks that had occurred this time. In this paper will be performed comprehensive analysis of 8 distinctive profiles. We used the information from monthly reports of geotechnical stability of excavated blocks in the period April 2009 to December 2010. New analyses will be done with four regression analysis: linear, polynomials of second and third degree and logarithmic, obtained analytical expressions of the stability factor as a function of time. Overall, stability in the open coal mine during data were taken for analysis (the period provide with trend analysis), is with the value of ratio of stability to almost all sections, of under 1, and going month after month, with a slight increase up even above 1.3 (an increase by 40%). This trend coincided with the trend analysis of new approach made in research analysis in this paper
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