Background : Stability slope is aspect critical in operation mining coal, specifically method mine open. Research This analyze stability slope in the mine rock coal Bengalon, East Kalimantan, with evaluate geometry slope, properties Mechanic rocks, and apply analysis probability for take into account uncertainty of input parameters. Referring to the Decree of the Minister of Energy and Mineral Resources No. 1827 K/30/MEM/2018 concerning Guidelines Implementation Good Mining Engineering Principles, research This covers measurement geometry slope, testing laboratory characteristic Mechanic rocks, analysis deterministic using method Spancer and Morgenstren - Price. Research results show that combination corner steep slopes, and variability strong shift land as well as material saturation significant lower factor security and improve probability failure slope. In the use of the Method Spencer Dan Morgenstren - Price appropriate used in Stability Analysis slope if back analysis was conducted on the properties mechanic’s rock. Method: Research method done with surveys and mapping, and conducting testing againsttheproperty physical and mechanical rocks. Secondary data related lithology in the research area and profile data company. Data collection techniques are carried out with geometry and result data testing characteristic physical and mechanical rocks. Data then processed use rocscience slide software with method spanker. Results : Results Stability level slope reviewed from mark factor security show slope the including slope No stable with mark factor security slope with burden Volvo FMX 400 Dump Truck is 48000 by 1.03 Approach analysis with the Spancer and Morgenstren Method - Price is right used in Stability Analysis slope if back analysis was conducted on the properties mechanics rocks . There are 2 settling ponds at PT Antareja Mahada Makmur Perkasa Inakakerta site, namely settling pond 81W and settling pond 71N. This study only discusses settling pond 81W. Settling Pond 81W has 6 compartments with different lengths, widths and depths. Conclusion : Stability level slope reviewed from mark factor security show slope the including slope No stable with mark factor security slope with burden Volvo FMX 400 Dump Truck is 48000 by 1.03 Approach analysis with the Spancer and Morgenstren Method - Price is right used in Stability Analysis slope if back analysis was conducted on the properties mechanics rocks . There are 2 settling ponds at PT Antareja Mahada Makmur Perkasa Inakakerta site, namely settling pond 81W and settling pond 71N. This study only discusses settling pond 81W. Settling Pond 81W has 6 compartments with different lengths, widths and depths.