text: N' oriri afọ 125 nke nchọcha na mmetụta ya, 'Natural Resources Institute (NRI), mahadum nke Greenwich, ekwela na mmetụta dị mma nke ngwaọrụ teknọlọjị e mepụtara na Naijiria maka' value chain development ' nke akụkụ mgbọrọgwụ na mba n' Afrịka.