L imestone mining is one of the economic activities of utilizing non-metallic natural resources for building materials. Limestone mining activities are carried out usingthe tiered quarry mining method. The purpose of this research is to determine thegeological conditions and the stability of the slope by finding the value of the slopesafety factor based on the correlation of Rock Mass Rating (RMR) data with theJanbu method based on the physical properties of the rock. The methodology ofthis study uses the stages of field data collection in the form of geological conditions and engineering geology and laboratory sample testing in the form of direct shear tests and compressive strength tests, then data processing is performed using Rock science slide 6.0 software and manual calculations based onthe Janbu method. Laboratory test results in the form of values average cohesion(± 6.19 Mpa), deep friction angle (± 30.14 °), and compressive strength test (±10.902 Mpa). Based on Janbu's method with Rockscience slide 6.0 software and Janbu's method calculation manually, this research area has an actual slope safety factor value of 0.575 which is categorized as unstable and has the potential for landslide rotations.