Na ụlọ ọrụ na-egwupụta akụ, ọkọlọtọ nkọwa nke beneficiation bụ ihe ọ bụla usoro na mma (uru) the economic value of mined ore. Removing valueless materials, results in a higher grade of

Na Sọnde, April 22, ụwa na-eme ememe Earth Day. Ọ malitere na 1970 na aghọwo kwa afọ omume hụrụ na otu ụbọchị, ebe dị iche iche ihe na-ẹkenịmde ka