sierra leone has a long history of mining, starting with diamond mining in the and gold mining before that. exploration results have revealed several mineral deposits around the country, including gold, bauxite and rutile. while production of bauxite, rutile, diamonds, and gold continues, several important exploration projects pointthe mining industry of sierra leone accounted for 4.5 percent of the countrys gdp in 2007 and minerals made up percent of total export revenue with diamonds accounting for percent of export revenue in 2008. the main minerals mined in sierra leone are diamonds, rutile, bauxite, gold, iron and limonite.. mining in sierra leone has been seen as one of the key factors for instability in the apr 16, 2019 mining and minerals. the country has significant reserves of iron ore, diamonds, bauxite, and gold. the country also has one of the largest rutile reserves in the world. total of mining companies were active in sierra leone in 2011 bringing in an estimated $12 million.