AH usoro slurry mgbapụta na ọtụtụ-eji nkà mmụta banyere ígwè, Ngwuputa, ịnweta nhazi, dredging, dewatering, na mmiri ọgwụ, coal ịsa, na nkume igwe nri, na naa ndepụta, tailing, ike, ewu ihe onwunwe .
