Nk?wa mkp?mkp?:

A na-ejikar? nnwale d? ukwuu site na teb?l 1100 na-eme ka ? d? obere, nke na-eme ka ? d? obere, na-ah?p?ta ya na-enwegh? isi, na-ah?r? 2 - ?kwa, w, nb, nb, cr, p, py minerals pyraite, na-eme ka e nwee ihe d? iche, na-eme ka ?r? d? iche iche, h?r? Etinyela 2 - 0,5 mm, 0,5 ~ 0.074 mm yarns.basi, nnwale nyocha - 0.074 mm, na nke d? iche iche ?ka, àkwá d? iche iche nwere nhazi d? elu, h?r? ad?gh? mfe, na-akwado ?d?, nwere ike ?nweta ?d? ikpeaz?.