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Gina Rinehart, Australia's richest person, has been dealt a significant blow with a court ruling that her company, Hancock Prospecting, must pay hundreds of millions of dollars in royalties to a rival mining family, Wright Prospecting.The Western Australian supreme court decision, which came on Wednesday, found that Wright Prospecting was entitled to a half share of royalties from the Hope Downs iron ore project, a joint venture between Rio Tinto and Hancock Prospecting.Hope Downs is a major mining project that exports around 45 million tonnes of iron ore annually from Australia's north-west. The court's ruling is a significant setback for Rinehart, who has been embroiled in a long-standing dispute with the Wright family over mining assets and royalties.The case, which began in 2010, has been a complex and lengthy battle, with multiple parties involved and over 4,000 documents submitted during the trial. The judge's findings, which ran to over 1,650 pages, noted that the dispute required a 'lengthy, diverse, and detailed reconstruction of events' dating back to the 1960s.Rinehart's company, Hancock Prospecting, has estimated that the historical payments to Wright Prospecting could be around $14 million per year, while the Wright camp estimates the amount could near $1 billion. The amount Hancock Prospecting and Rio Tinto are liable to pay will be the subject of a future hearing.The decision has been claimed as a partial victory by all parties involved, with Wright Prospecting welcoming the ruling and Hancock Prospecting declaring victory on the issue of ownership rights over the valuable assets.The 16-year court case may still have many years yet to play out, with neither side ruling out appealing against the verdict.

Gina Rinehart, Australia's wealthiest person, faces a potentially significant loss of wealth and control over her Pilbara iron ore empire as a court verdict looms in Perth. The Western Australian supreme court judgment will determine whether Rinehart must share the spoils of some of Hancock Prospecting's most lucrative iron ore projects with the family of her late father's business partner, Peter Wright.The dispute centers on the lucrative Hope Downs mining complex near Newman in north-west Western Australia, a joint venture between Hancock Prospecting and Rio Tinto, which delivered a $832m profit to Hancock Prospecting in 2025. The Wright family heirs claim they are entitled to an equal share of the 2.5% royalties coming from Hope Downs to Hancock Prospecting.Hancock Prospecting rejects the claim, arguing it undertook all the work and bore the financial risk of development, making it the legitimate owner of the Hope Downs assets. The judgment, expected to be appealed regardless of the outcome, may also impact Rinehart's children, who have accused their mother of an 'egregious fraud' against them.Rinehart's company and Hancock Prospecting have rejected all claims, with Rinehart's lawyers arguing that her actions were done to right an historic wrong by her father. The court's decision will also inform a separate federal arbitration process that will decide how Hancock Prospecting's shares are divided between the family.In a related development, Hancock Prospecting's latest annual report shows that more than $6.4bn in dividends have been placed in reserve pending the outcome of arbitration.