Analisis Kestabilan Lereng pada Fasilitas Penampungan Residu di Kawasan Pertambangan Bauksit PT. Cita Mineral Investindo Tbk, Kabupaten Ketapang, Kalimantan Barat = Residue Storage Facility Slope Stability Analysis in Bauxite Mining Area of PT. Cita Mineral Investindo Tbk, Ketapang Regency, West Kalimantan