Under the new constitution approved in January 2009, the state now controls all minerals, metals, precious and semi-precious stones in the country.
While respecting previously granted concessions to private companies, it has restricted new concessions to joint ventures with the state
In 2007, the Bolivian government returned 100% control of the Huanuni tin mine to the state-owned Comibol.
On May 3, the government nationalised the Glencore-owned antimony smelter, which has been out of operation for more than two years.