Rancangan Geometri Lereng Overall Sidewall pada Tambang Batubara Area Blok Mutiara PT. Singlurus Pratama Kabupaten Kutai Kartanegara Provinsi Kalimantan Timur.

PT. Singlurus Pratama is a coal mining company located in Kutai KartanegaraProvince of East Kalimantan. Located of mining area is divited into some Block,Sungai Merdeka Block, Argosari Block, Mutiara Block, and Margomulyo Block.Now, mining only done on the Sungai Merdeka Block stream free because others arestill in the stage of geotechnical study for done geotechnical, PT. Singlurus Pratamajoin with Mineral & Coal Studio.The Process schedule of geotechnical are taking a sample in the field, withdrilling geotechnical rock properties testing in labs and analysis geotechnical in thiscase the author of a case study on geotechnical study to Block Mutiara location on theBlock Mutiara mining plan represented by drill hole GT-04, GT-05 and GT-08. Inputdata for making model geotechnical use for dry density (γd) and saturated density(γd) result of physical testing, whereas cohesion (C) and friction angle in direct sheartest results are valuable rest. Geotechnical modeling using program Rocscience SlideV6 assistance program with the limit equilibrium method.Geotechnical modeling single slope is done on a high 10 m angle 60°, whilethe overall slope modeling is done on a high 50 m, 60 m, and 70 m, angle 25°, 40°,45°, and 50° with properties meaning material of the entire drill hole. All of modelingput in dry soil water conditions half saturated and unsaturated.Recommendation of geotechnical the entire sidewall slopes in dry condition60 m high with an angle of 40°, condition saturated high 50 m and an angle 40° andcondition saturated high 50 m and an angle 25°. Recommendation of geotechnical theentire based on the value of FK safe, FK≥1,20 for single slope FK≥1,30 for slopeoverall sidewall (Canmet, 1979). Based on the result of modeling the potential forlands slides on slopes overall sidewall is circular failure, because the materialconstituent slope is soft rock and the nature such as soil.