17:32 BST update
Three-month aluminium prices closed at $1,739.75 per tonne, down $36.25. Cash prices for the light metal were at $1,698.85.
Base metals prices continued to drift lower as the market closed in London on Friday, with the exception of tin, which clawed back $25 day-on-day to close at $15,600 per tonne on a three-month basis. Nickel prices lost the most ground, declining $185 on a three-month basis. The tom-next spread for the alloying metal ended the week in a $5 backwardation, while the cash-to-three-month contango stood at $32. Closing aluminium prices have yet to be confirmed.
On the SHFE, the most-traded August copper contract was trading at 44,220 yuan ($7,217) per tonne at 1129 Shanghai time, after opening at 44,130 yuan per tonne.
10:18 Shanghai time update:
Traders are keeping a close eye on the spreads on aluminium, which have stablised somewhat...