The Dairi Lead-zinc Project is located in northwest Sumatra, Indonesia, about 150 km from Medan, the third largest city of Indonesia. The Project is the first one invested and constructed by NFC in the Indonesian market, with the scale of 1 million t/a lead and zinc mining plant, for which the ramp development and filling mining method are adopted. The selected raw ore for the concentrator has the lead grade of 7.92% and the zinc grade of 12.84%. Upon the completion and operation, the average annual output of lead concentrate is 105,000 t with the lead content of 56.38%, and the annual output of zinc concentrate is 225,000 t, with the zinc content of 51.62%.