Agriculture (including forestry and fishing) contributed an estimated 10 percent of GDP in 1999, and employed about 41 percent of the labor force . The forestry sector alone accounted for an estimated 3 percent of GDP in 1997 and engaged an estimated 15 percent of the working population in 1991. The exploitation of Gabon's forests (which covers about 75 percent of the land area) is a principal economic activity. Although Gabon's territorial waters contain important fishing resources, their commercial exploitation is minimal.
Industry (including mining, manufacturing, construction, electricity, and water) contributed an estimated 60 percent of GDP in 1999, and about 12 percent of the working population were employed in the sector. Industrial GDP increased at an average annual rate of 2.7 percent from 1990 to 1997. Mining alone (including oil) accounted for an estimated 46 percent of GDP in 1997. Gabon is among the world's foremost producers and exporters of manganese. Gabon's manufacturing sector is relatively small, accounting for an estimated 6 percent of GDP in 1997. A substantial part of this is represented by
Services engaged 47 percent of the economically active population and provided an estimated 30 percent of GDP in 1999. The GDP of the service sector increased at an average annual rate of 3.3 percent over the period from 1990 to 1997.