Pengaruh Lingkungan Pengendapan terhadap Kualitas Batubara pada PIT "X" PT. Insani Baraperkasa, Kecamatan Loa Janan, Kabupaten Kutai Kartanegara, Provinsi Kalimantan Timur = The Influence of Deposition Environment on Coal Quality in PIT "X" PT. Insani Baraperkasa, Loa Janan District, Kutai Kartanegara Regency, East Kalimantan Province