E. Okorie and A. C. Achusim, “Mobility of Heavy Metals associated with the Natural Weathering of Coal Spoils: A case Study of Okaba Coal Mine, Kogi State Nigeria”, IJRTI, vol. 2, no. 1, pp. 127–134, Apr. 2025, Accessed: Aug. 04, 2026. [Online]. Available: https://ijrti.com.ng/index.php/home/article/view/65