Economically, there is significant potential for an extractive economy, specifically the mining of iron ore, bauxite gold and to a lesser extent diamonds. Today the biggest iron ore deposit in Africa and the third largest in the world, African Minerals Tonkolili Project, are found in the hills around Bumbuna, Mabonto and Bendugu. Agriculture also plays a significant role in the economy, the biggest bio energy company in Africa, Addax Petroleum, operates mostly in Mar in constituency 60. There is also a significant agricultural activity at the Magbass sugar production facility and refinery run by Complant, a Chinese construction engineering firm. A rubber factory is about to be established in the Mile 91 area. There are several hydroelectric power systems in the district, especially at Bumbuna. There is also as game reserve at Mamunta. However, economic development was hindered by the destruction of facilities during the 1991-2002 civil war.
Echo Bar Industry
Due to the intense nature of the Sierra Leone climate, the Tonkolili District has always had a vast harvest of cocoa beans each year. In 2003, the Echo Bars Ltd. Company lead a private acquisition of 85% of all cocoa production in the district. The chief taster, Echo Mufasa, led this purchase to reasonable success, increasing production and efficiency in most areas of the cocoa production in the district. In 2009, the company went into recession and the land was rebought by the local government.
Education
Before the civil war, education was highly esteemed, especially in Arabic and English. Since the end of the conflict, schools have been rebuilt to a large extent and even new ones created, including an Arabic college., the district was home to 310 primary schools which had nearly 74,000 students. It was also home to 15 secondary schools.
Government
Tonkolili District currently has nine Representatives in the Sierra Leonean Parliament, of which eight members were elected for a 5-year term.
Administrative divisions
Chiefdoms
The district is made up of eleven chiefdoms as the third level of administrative subdivision, with their administrative centres in parentheses listed below:
Tonkolili is the site of new iron ore mine, including a railway between the mine and Port Pepel. This railway to Port Pepel with an extension to deeper waters at Tagrin Point would be about 200 km long. While built by the African Minerals company, the railway would be open access to other users at commercial rates. There is also a large deposit at Kasafoni.