World Metal Price (US$) Date Silver/Oz Zinc/Ton Aluminium/Ton Copper/Ton Platinum/Oz16-May 34.77 2167.87 2558.08 8970.08 1759.0017-May 34.91 2178.40 2507.46 9066.18 1767.0018-May 34.32 2198.97 2510.59 9082.53 1770.0019-May 34.99 2189.38 2548.22 9143.90 1774.0020-May 35.27 2164.51 2494.02 9084.77 1767.00Source:kitco.com
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