American mere nchịkọta, topsoil, imegharị ihe maka iji, scalping & screening ígwè wuru arọ-oru ona nta ka ọ bụla size ọrụ ma ọ bụ ihe onwunwe. 
American mere nchikota, topsoil, imeghari ihe maka iji, scalping & screening igwè wuru aro-oru ona nta ka ọ bula size orụ ma o bu ihe onwunwe. 