from 1957 to 1962, plutonium was dispersed widely over much of the area. Compensation in 1993 of was determined after three elders flew to London and presented samples of the contaminated soil in London in October 1991. In 1962, the long-serving Premier of South Australia, Sir Thomas Playford, made a promise that their traditional lands would be restored to the people displaced at Yalata sometime in the future. Under the administration of his successor Frank Walsh, short two-week long bush trips were permitted, enabling them to re-connect with their traditional lifestyles. As negotiations got underway in the 1980s, the Indigenous peoples started setting up outstations near their original lands. With the passage of the Maralinga Tjarutja Land Rights Act 1984 under Premier John Bannon's government, the Maralinga Tjarutja secured freehold title in 1984, and the right to developmental funds from the State and Federal governments. They completed a move back into the area, to a new community called Oak Valley in March 1985. Under an agreement between the governments of the United Kingdom and Australia in 1995, efforts were made to clean up the Maralinga site, being completed in 1995. Tonnes of soil and debris contaminated with plutonium and uranium were buried in two trenches about deep. The effectiveness of the cleanup has been disputed on a number of occasions. In 2003 South Australian Premier Mike Rann opened a new school costing at Oak Valley. The new school replaced two caravans with no running water or air-conditioning, a facility that had been described as the "worst school in Australia". In May 2004, following the passage of special legislation, Rann fulfilled a pledge he had made to Maralinga leader Archie Barton as Aboriginal Affairs Minister in 1991, by handing back title to of land to the Maralinga Tjarutja and Pila Nguru people. The land, north-west of Adelaide and abutting the Western Australia border, is now known as Mamungari Conservation Park. It includes the Serpentine Lakes and was the largest land return since Premier John Bannon's hand over of Maralinga lands in 1984. The returned lands included the sacred Ooldea area, which also included the site of Daisy Bates' mission camp. In 2014, the last part of the land remaining in the Woomera Prohibited Area, known as "Section 400", was excised and returned to free access. Maralinga Tjarutja Council The Maralinga Tjarutja Council is an incorporated body constituted by the traditional Yalata