Daughter sues mother over $30M mining fortune, claims broken farm promise

Twenty years after her father's death in a plane crash over Malawi, Sapphire Halliday walked into Victoria's Supreme Court with a claim that hinged on a promise made when she was eighteen. Her father, Garnet Halliday, had been a senior executive at the mining company Paladin when he died in 2007, leaving behind an estate worth more than $30 million—including $26 million in company shares, a $1.6 million life insurance policy, and a 70-hectare farm in Macedon valued at roughly $3 million at the time. His will left most of it to his wife, Deborah, with only $50,000 to Sapphire's half-brother Kaden from a previous marriage. When Kaden challenged the will, he received additional money. Sapphire, facing a similar choice, says her mother made her a different offer: stay quiet about the will, and the farm would eventually be hers—or at least a share worth about $2 million, equal to what her half-brother received. She also claims her mother promised to leave her own portion of the farm to Sapphire in her will, provided the property was never sold and Sapphire helped run the family business.

Sapphire says she accepted that deal. She gave up her right to challenge her father's will. She abandoned her plans to study agriculture at university. For more than a decade, she worked on the farm for wages below the legal award rate, building cattle herds and managing operations. But by 2023, the farm's financial picture had darkened. Deborah Halliday had suffered a stroke in 2021 that left her unable to manage a business already trading at a loss. In May of that year, she sent her daughter a text message: "I hoped to pay you out like I paid [Kaden]," she wrote, "but I just cannot pay you out at the moment." At another point, according to court documents, Deborah told Sapphire plainly: "the farm is mine."

By late 2023, Deborah had begun borrowing heavily against the property. She took out nearly $1 million in loans from a private couple, a litigation funder covering her legal costs, and a third lender to manage cashflow. The total debt climbed to about $2.5 million. In July 2025, Sapphire lodged a caveat—a legal claim freezing the property—arguing that it would be fundamentally unfair for her mother to break a promise she had relied on for two decades. This is known in law as proprietary estoppel. Deborah received notice from a solicitor three days later and learned her daughter was making a claim on the farm. She denied ever making the promise Sapphire described and argued that even if she had, parts of it were not legally binding.

The case turned on competing versions of a conversation that happened when Sapphire was barely an adult, with no witnesses and no written agreement. Deborah's solicitor told the court that his client had no savings, no other property, and no steady income. She was, in effect, insolvent. The farm was now worth between $14 million and $15 million—far more than when Garnet died—but it was encumbered by debt and the subject of an active sale process to pay creditors. Associate Justice Barrett found that Sapphire had made out a credible case for proprietary estoppel. The text messages supported her claim that her mother had promised her something—though the judge noted they pointed to a payment of $1.5 million to $2 million or a percentage of the sale price, not ownership of the entire farm. He also weighed the risk to Deborah's creditors, who had lent money in good faith, against the risk to Sapphire's claim. The balance, he decided, favored allowing the sale to proceed.

But the judge did not leave Sapphire empty-handed. He ordered the caveat removed on one condition: $2.5 million would be paid into court or held in a trust account, securing both the value of Sapphire's claim and the debts that had accumulated since she filed it. The farm could be sold, but the money would be held pending the outcome of the case. No trial date has been set. Mediation is scheduled for March 2027. Until then, the farm's sale hangs in a kind of legal suspension—the property moving toward a buyer, but its proceeds locked in court, waiting for a judge to decide whether a promise made two decades ago, in the aftermath of grief and loss, was binding enough to reshape the inheritance of a $30 million estate.