Seaborne semi-carbonate manganese ore held at $4.12 per dmtu, while the high-grade index edged up to $4.84 per dmtu. Chinese port prices strengthened after silico-manganese producers increased bookings, although port inventories rose above 6.29 million tonnes. Silico-manganese advanced to 5,650-5,740 yuan per tonne on stronger futures and lower social stocks. Smelter margins nevertheless remained constrained by rising ore, coke and electricity costs.
