The mining industry of Senegal is mainly centred on the production of phosphates and industrial limestone. Senegal is one of the leading producers of phosphates in the world, accounting for about 6% of exports in 2006, and deposits are of a particularly high quality. In the coastal region of the country, titanium-bearing minerals have been found and the reserve is estimated at 10 million tons. The mineral sector's exports accounts for 20% of total exports of the country and constitutes 20% of the GDP.