Perth Mint has produced the world’s largest gold bar, a 521.2-kilogram block of 99.999 per cent pure Australian gold valued at more than A$100 million. The Guinness World Record showcases the refining expertise required to turn more than half a tonne of gold into a single verified bar.
The record was achieved on July 9, 2026, after about a year of planning and a practice run. Guinness officials monitored the production and verification process, which took up to three days.
Key details
- Weight: 521.2 kilograms
- Purity: 99.999 per cent
- Estimated metal value: More than A$100 million
- Record achieved: July 9, 2026
- Previous record: 300.12kg
- Project team: More than 35 specialists
How much is the 521.2kg gold bar worth?
Perth Mint chief executive Paul Graham placed the underlying metal value at more than A$100 million. That estimate can change because gold is traded in US dollars and its Australian-dollar value is also affected by exchange rates.
The bar contains approximately 16,758 troy ounces of gold. Spot gold was quoted at about US$4,079 an ounce when the record was reported, but that calculation reflects only the approximate metal value.
Perth Mint has not announced plans to sell the bar. Its Guinness status and unique character could give it additional historical or promotional value beyond the gold it contains.
What does 99.999 per cent purity mean?
The bar reached “five-nines” purity, meaning only a very small proportion consists of material other than gold. Graham said the widely used high-purity standard was 99.99 per cent.
Achieving an additional level of purity becomes progressively harder as refiners remove the final traces of other elements. Maintaining that standard across 521.2kg required precise refining, testing and contamination controls.
How Perth Mint created the record-breaking bar
According to the Perth Mint’s official project account, approximately 1.5 tonnes of raw material was prepared during the wider operation.
Six large bars and several smaller bars were loaded into a specially designed graphite mould. The mould was placed in a Flameless Casting Chamber, where the gold was heated to approximately 1,400 degrees Celsius.
The enclosed system limited employees’ exposure to molten metal while allowing close control over the casting conditions. After hours of cooling, the completed bar was placed on calibrated scales and officially recorded at 521.2kg.
Who worked on the project?
More than 35 specialists contributed, including experts in refining, metallurgy, engineering and quality assurance. Safety, logistics, security and project-delivery teams also supported the record attempt.
Gold was contributed by AngloGold Ashanti Australia, BHP, Evolution Mining, Gold Fields, Greatland, Newmont Australia, Northern Star, Norton Gold Fields and Pantoro.
Graham called it the “People’s Bar,” reflecting the involvement of miners, refiners and technical workers across the Australian gold industry.
Which previous world record did it break?
The previous record belonged to Emirates Minting Factory in Dubai, which created a 300.12kg gold bar in November 2024.
Perth Mint’s creation is approximately 221kg heavier, an increase of nearly 74 per cent. Its size and five-nines purity make the achievement particularly significant from a refining perspective.
Why did Perth Mint make the bar?
The bar is a demonstration of technical capability rather than a normal retail bullion product. It promotes Perth Mint’s ability to refine, assay and cast precious metals at an exceptional scale.
The organisation has refined precious metals for more than 125 years. The project also provides international exposure for the mining companies and specialists supporting Australia’s gold supply chain.
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Where can people see it?
The bar will be displayed intermittently as part of the Perth Mint Gold Tour. Visitors should check its availability before travelling because it may not remain on continuous public display.
It will join another record-breaking Perth Mint attraction, the Australian Kangaroo One Tonne Gold Coin unveiled in 2011. The Mint has not said whether visitors will be permitted to touch the new bar.
Why the record matters for Australia
Australia’s gold export earnings are forecast to increase from A$47 billion in 2024–25 to A$60 billion in 2025–26. That could make gold the country’s second-largest export earner after iron ore.
Commodity prices remain important to Australia’s economy, while operating costs are creating challenges elsewhere, including rising power bills affecting industrial businesses in Tasmania.
Strong gold prices may benefit miners and exporters, but households face different financial pressures, including mortgage offset account errors affecting Australian borrowers.
The A$100 million figure should be understood as an estimated metal value, not a confirmed sale price. The bar’s wider importance comes from its verified weight, exceptional purity and the Australian expertise needed to produce it.
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