The Market Vectors Gold Miners ETF (Ticker: GDX) seeks investment results that correspond generally to the performance, before fees and expenses, of the Amex Gold Miners Index. The index is a modified market capitalization-weighted index comprised of 35 publicly traded companies involved primarily in the mining for gold and silver. Stocks must have a market cap exceeding $100 million and have traded on an average daily volume of at least 50,000 shares over past six months. The Fund normally invests at least 95% of its total assets in common stocks and ADRs that comprise the Index. The weight of any single component security may not account for more than 20% of the index value; the aggregate weight of those component securities which individually represent more than 4.5% of the index value may not account for more than 50% of the total index value.