Date Sept. 21 Sept. 18 Sept. 17 Sept. 16 Sept. 15 BASE METALS (London Metal Exchange -- Midday official cash/3-month prices, US$ per tonne) Al Alloy 1680/1705 1740/1770 1680/1710 1660/1690 1650/1680 Aluminum 1836/1871 1922/1955.50 1913.50/1946.50 1851/1880 1813/1842 Copper 6089/6090 6231/6256...
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