The S&P/ASX 300 Metals & Mining (XMM) index contains companies in the S&P/ASX 300 that are classified as members of the Metals & Mining Industry. Constituents include producers of gold, steel and precious metals. No Exchange Traded Fund tracks the index. To be eligible for inclusion in the ASX 200 Index: Market capitalization: A stock's weight in the index is determined by the float-adjusted market capitalization of the stock. This is a function of current index shares, the latest available stock price and the Investable weight factor (IWF).