The Metal Bulletin Copper Concentrates Index was calculated at $92.70 per dry metric tonne/9.27 cents per lb on Friday January 15, down 3.4% on levels seen at the end of December.
The index fell as traders booked spot cargoes in the mid-$80s/8s in private sales and public tenders held during the period, and a small number of sales to smelters were concluded in the $90s/9s.
Two trade sources said a parcel of Cerro Verde concentrates had been sold at about $85/8.5, while a tender for two parcels of Escondida held in mid-December was also said to have concluded between $82/8.2 and $85/8.5.
Traders were also awaiting the results of tenders for Northparkes and Bisha concentrates at the time the index was published on Friday. Participants in the Northparkes tender said it was likely to conclude in the $80s/8s.
While traders were actively purchasing during the period, there were only a...