Indonesia's anti-graft commission says it is investigating the country's minister of energy and mines for alleged corruption.

The Corruption Eradication Commission said Wednesday that Jero Wacik is suspected of extorting about $840,000 from mining companies from 2011 to 2013.

Wacik, a senior official with the ruling Democratic Party, is the third Cabinet minister in President Susilo Bambang Yudhoyono's government to be named a corruption suspect.

In July, the anti-graft court sentenced a former sports minister to four years in prison for corruption related to the construction of a sports complex.

In May, the anti-graft agency accused the minister of religious affairs of mismanaging expenses for the hajj pilgrimage.

Endemic graft in Indonesia has been blamed for deterring foreign investment. Transparency International regularly lists the country among the most corrupt nations.