Faiz, A. N., & Darmansyah, A. (2025). Optimizing Coal Reserves at Pit Muara Tiga Besar Utara (MTBU) PT Bukit Asam to Increase Production in 2025. Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE), 8(3), 14930-14947. https://doi.org/10.31538/iijse.v8i3.7702