Under normal circumstances, the fund invests at least 80 percent of its net assets, plus the amount of any borrowings for investment purposes (calculated at the time of any investment), in securities of companies in the natural resources sector. For purposes of the funds 80 percent investment policy, the natural resources sector includes companies belonging to one of the following Global Industry Classification Standard (GICS) categories: (i) Agriculture: Agricultural Products & Services, Fertilizers & Agricultural Chemicals, Forest Products, Paper & Plastic Packaging Products & Materials, Paper Products and Timber REITs ; (ii) Oil and Gas: Integrated Oil & Gas, Oil & Gas Drilling, Oil & Gas Exploration & Production, Oil & Gas Refining & Marketing and Oil & Gas Equipment & Services; (iii) Coal: Coal & Consumable Fuels; (iv) Industrial Metals: Aluminum, Diversified Metals & Mining, Steel and Copper; and (v) Precious Metals: Gold, Precious Metals & Minerals and Silver. The fund may invest in companies of any market capitalization.