London - Final prices in dollars per ton - cash and forward. Also given are the previous trading day's quotationsj cash forward Copper 6,495.50 ( 6,516.50) 6,515.00 ( 6,537.50) Lead 2,265.50 ( 2,311.50) 2,290.50 ( 2,337.50) Zinc 2,154.00 ( 2,181.50) 2,180.00 ( 2,207.50) Tin 14,905.00 (15,015.00) 14,825.00 (14,925.00) Aluminium (no quote)( 1,725.00) (no quote) (1,755.00) Nickel 17,677.50 (17,732.50)17,737.50 (17,792.50)