Oke ngwa:
1. Ịsacha ájá, ájá a na-eme igwe, ebe a na-agwakọta apịtị, apịtị apịtị, apịtị ihe owuwu, nkwụsị nke ikpokọta apịtị;
2. Dewatering na akọrọ mkpofu nke na-abụghị ọla ịnweta tailing, dewatering nke na-abụghị metallic mineral pulp;
3. Mkpọpu akọrọ nke ígwè ore tailing na dewatering nke itinye uche ntụ ntụ.