HONG KONG: Brazil's Vale mining company, the world's biggest producer of iron ore, says that a secondary listing of its shares will start trading on the Hong Kong stock exchange Wednesday as it seeks greater access to investors in China's booming economy. Vale SA said Sunday the shares will be in the form of two classes of Hong Kong Depositary Receipts. Vale officials said the company will not be raising any money by selling new shares. Each depositary receipt will instead represent one Vale share traded in Sao Paulo, Brazil, where Vale's primary listing is. Executives said they hope to attract more investors from Asia.