Nata, R., and A. Alexander. “Analysis Stability Of Slope in Pit B Miyor Pratama Coal Accompany, Kumanis Atas Village, Talawi Regency, Sawahlunto, West Sumatera”. PROMINE, Vol. 7, no. 1, June 2019, pp. 15-19, doi:10.33019/promine.v7i1.1056.