and sale of uranium. Rio Tinto's uranium operations are located at two mines: the Ranger Uranium Mine of Energy Resources of Australia and the Rössing Uranium Mine in Namibia. The company is the third-largest producer of uranium in the world. According to Rio Tinto's website, the company institutes strict controls and contractual limitations on uranium exports, limiting uses to peaceful, nonexplosive uses only. Such controls are intended to limit use of the company's uranium production to use as fuel for nuclear power plants only, and not for use in the production of nuclear weapons. Rio Tinto Energy was responsible for 12% of revenues and 18% of underlying earnings in 2008. Diamonds: Rio Tinto Diamonds Rio Tinto Diamonds operates three diamond mines: the Argyle Diamond Mine in Western Australia (100% ownership), the Diavik Diamond Mine in the Northwest Territories of Canada (60% ownership), and the Murowa Diamond Mine located in Zimbabwe (78% ownership). Together, these three mines produce 20% of the world's annual production of rough diamonds, making Rio Tinto the world's third-largest producer of mined diamonds. The diamond business unit's most advanced exploration project is the Falcon Project in Saskatchewan, Canada, where Rio Tinto owns 60% of the project in a joint venture with Star Diamond Corp. Rio Tinto Diamonds generated 1% of revenues and earnings for Rio Tinto in 2008. Industrial minerals: Rio Tinto Minerals Rio Tinto Minerals is a diverse business group with mining and processing interest in borates, salt and gypsum. Rio Tinto Borax, with operations in California, supplies nearly one-third of the world's annual demand for refined borates. The Minerals group is also majority owner of Dampier Salt, which produces over 9 million tonnes of salt and 1.5 million tonnes of gypsum annually from its three facilities in north-west Australia. Rio Tinto Minerals accounted for 6% of company revenues, and contributed 3% to earnings in 2008. On 31 January 2010, the management of U.S. Borax locked out its hourly workforce, replacing the workers with nonunion workers and managers from other Rio Tinto operations. The 560 International Longshore and Warehouse Union Local 30 members immediately began a fireside vigil that garnered national and international labour attention. ILWU filed several unfair labour practices against the company, including an illegal lock-out claim. Iron products and titanium: Rio Tinto Iron and Titanium Titanium dioxide is mined at three locations in Canada, South Africa and Madagascar, and refined at QIT-Fer et