LONDON, May 24 (UPI) -- Closing bid and ask prices on the London Metals exchange Monday: (quoted in U.S. dollars per metric ton): Bid Ask Copper grade A Cash 1460.00 - 1461.00 3 mths 1492.00 - 1493.00 15 mths 1565.00 - 1575.00 Tin Cash 5650.00 - 5660.00 3 mths 5650.00 - 5655.00 15 mths 5570.00 - 5580.00 Lead Cash 522.50 - 523.50 3 mths 523.00 - 524.00 15 mths 518.00 - 523.00 Zinc special high grade Cash 993.00 - 994.00 3 mths 1015.50 - 1016.00 15 mths 1037.00 - 1042.00 London silver large Cash 5.0700 - 5.1000 3 mths N/A - N/A 12 mths N/A - N/A Aluminium high grade Cash 1305.00 - 1306.00 3 mths 1332.00 - 1332.50 15 mths 1385.00 - 1390.00 Nickel Cash 5400.00 - 5410.00 3 mths 5475.00 - 5480.00 15 mths 5650.00 - 5670.00 Aluminium alloy Cash 1218.00 - 1223.00 3 mths 1235.00 - 1240.00 15 mths 1270.00 - 1290.00  