The case dates back to 2014, when the brothers, whose names were not disclosed, are said to have been caught stealing electricity from a local utility provider in order to power bitcoin mining devices at a location in Rotterdam. Prosecutors said this week that, in total, the brothers mined roughly €200k ($223,000) worth of bitcoin prior to being caught.
According to the Openbaar Ministerie, the public prosecutorial service in the Netherlands, the brothers have both been charged with money laundering. One brother, who owned the property in which the devices were kept, has also been charged with stealing power to grow marijuana plants at the same location.
http://www.coindesk.com/brothers-face-jail-time-allegedly-stealing-power-mine-bitcoins/
Mining Bitcoins in itself is not laundering money, unless that country has a different sets of rules like some. We should first also consider the rules of the specific country.