GAMCO Natural Resources, Gold & Income Trust is a non-diversified closed-end management investment company. The company's primary investment objective is to provide a high level of current income from interest, dividends, and options premiums with its secondary objective being capital appreciation. Under normal market conditions, the company invests majority of its assets in securities of companies principally engaged in the natural resources and gold industries, and also engages in writing covered call options on the underlying equity securities. Its portfolio consists of securities from different sectors such as metals and mining, energy and energy services, specialty chemicals, agriculture, healthcare, machinery, food and beverage, and others.