Beijing, June 15: The following is a summary of China's production of copper, aluminum, alumina, zinc, lead, and steel by the National Bureau of Statistics released in May 2005. (Note: monthly data are initial values) May-May quantities (tons) Year-on-year changes (%) Quantity (tons) Year-on-year changes (%) Refined copper 222,400 21.5 964,200 19.5 Aluminum 581,300 9.6 2,813,300 14.5 Alumina 700,400 17.2 3,266,000 16.2 Zinc 221,700 4.2 1,062,500 6.8 Lead 190,500 23.9 844,700 16.9 Tin 9,796 15.9 44,968 14.1 Magnesium 38,700 6.0 192,400 14.6 Iron and steel 29,729,600 37.5 136,154,800 27.4 Steel dominance 31,106,300 35.5 142,818,100 25.4 The following is the revised data for the National Bureau of Statistics on April metal production: Prior to the new estimate Estimated value Refined copper 194,700 193,100 Aluminum 574,900 592,100 Alumina 653,900 654,500 Zinc 226,800 226,700 Lead 194,600 192,300 Tin 12,359 7,523 Magnesium 42,000 40,800 Steel 28,566,500 28,085,800 Steel products 29,210,000 29,530,900