91热爆

The global mining giants BHP Billiton and Vale face opposition to restarting the Samarco operation in Brazil, following the disaster of a dam collapsing last year. We get a report from the region, which hears the views of local people.

We also analyse what Brazil is doing to provide electricity from sources other than hydro-power, which is proving unreliable amid drought.

Friday gives the 91热爆's Business News team a chance to reflect on another busy week. Developments such as Switzerland opening the world's longest tunnel under the Alps and Saudi Arabia investing in the online taxi hailing service Uber are analysed with Joe Weisenthal, from Bloomberg in New York and Josie Cox of the Wall Street Journal in London.

(Picture: Rio de Janiero: Copyright: Getty Images.)