Final prices in dollars per ton - cash and forward. Also given are the previous trading day"s quotations, according to dpa. # cash forward Copper 6,923.50 ( 6,807.50) 6,967.50 ( 6,852.50) Lead 2,329.50 ( 2,285.50) 2,362.50 ( 2,317.50) Zinc 2,421.00 ( 2,390.50) 2,459.50 ( 2,427.50) Tin 15,845.00 (15,720.00) 15,925.00 (15,800.00) Aluminium 1,945.00* ( 1,945.00) 1,975.00* ( 1,975.00) Nickel 17,837.50 (17,062.50) 17,137.00* (17,137.50) * from December 18 #