( dpa )- Final prices in dollars per ton - cash and forward. Also given are the previous trading day's quotations. Cash forward Copper 8,657.50 ( 8,510.50) 8,572.50 ( 8,440.50) Lead 3,427.50 ( 3,373.00) 3,422.50 ( 3,365.00) Zinc SH 2,820.00 ( 2,725.00) 2,837.50 ( 2,742.50) Tin 18,865.00 (18,670.00) 18,950.00 (18,725.00) Aluminium 2,770.00 ( 2,760.00) 2,810.00 ( 2,800.00) Nickel 33,112.50 (31,650.00) 33,287.50 (31,825.00)