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In page Economy of Sierra Leone:

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Sierra Leone has one of the world's largest deposits of rutile, a titanium ore used as paint pigment and welding rod coatings. Sierra Rutile Limited, fully owned by Nord Resources of the United States, began commercial mining operations near Bonthe in early 1979. Sierra Rutile was then the largest non-petroleum U.S. investment in West Africa. The export of 88,000 tons realized $75 million for the country in 1990.[citation needed]