The third largest sector is the mining industry. Riau Islands is the largest bauxite producing region in Indonesia. This can be seen from the number of bauxite mining companies. Since 2008, the number of bauxite mining companies has always been the highest compared to other mining companies, although the number has always dropped from 2008 to 2010. In 2009 the number of bauxite companies fell by 37 companies to 32 in 2010. This decline also had an impact on the decline in the number of workers and output produced by this sector. The tin company is the second largest company in the Riau Islands after bauxite. Tin companies also have the same situation as bauxite companies that are experiencing a decline. The tin company which initially had 25 companies in 2009 decreased to 22 companies in 2010.