Rio Tinto...has been thrown out of a sovereign wealth fund's portfolio [Norway's Government Pension Fund - Global] for allegedly subjecting it - potentially - to "grossly unethical conduct" through its involvement in the world's biggest gold mine... Kristin Halvorsen, the Norwegian finance minister, said the problems with Rio Tinto, the world's second-largest iron ore miner, concerned a joint venture with Freeport McMoRan, a company excluded by the fund in 2006, at a mining operation in Indonesia... Rio Tinto expressed frustration at the move by the Norwegians, saying it was long-recognised as a leader in the field of environmental consciousness and was not even the operator of the Grasberg mine... The government chose to keep its Monsanto shares and had worked within the company to bring about a "significant reduction in the use of child labour" in cotton seed production in India. [other companies excluded by fund: BAE Systems, Serco, Wal-Mart, Lockheed Martin]