Close to three-quarters of all the gold newly mined in Australia is refined at a single site near Perth Airport — The Perth Mint, the trading name of Gold Corporation, a statutory body wholly owned by the Government of Western Australia and backed by a sovereign guarantee written into the Gold Corporation Act 1987. It has refined and sold gold since 1899, when it opened as a branch of Britain’s Royal Mint to turn the output of the Kalgoorlie goldfields into coin. Its bars clear on the LBMA Good Delivery List and the major bullion exchanges — the accreditation that lets a counterparty accept them at stated value without re-assaying the metal. So a Perth Mint hallmark is a claim about everything standing behind it: the refiner, the standards it answers to, and a compliance record that has itself been tested and reviewed in public. History, production, and authentication are what that claim rests on.
Entity, ownership, and government guarantee
The hallmark on the bar reads Perth Mint; the party on the contract is Gold Corporation. The Perth Mint is the trading name of Gold Corporation, a statutory body corporate established under the Gold Corporation Act 1987 (Western Australia) and wholly owned by the Government of Western Australia. Gold Corporation runs the refining, bar manufacturing, and bullion trading on the State’s behalf, and it is the name that contracts, invoices, holds the accreditations, and appears on the registry. On an entity file or a supply agreement, Gold Corporation is recorded as the legal name, with The Perth Mint as the mark it produces under.
Under Section 22 of the Gold Corporation Act, the Treasurer of Western Australia guarantees, in the name of the Crown, the cash equivalent of gold payable and deliverable by Gold Corporation and the moneys it owes under the Act. The guarantee is statutory, fixed in legislation and independent of the firm’s balance sheet, and it holds as a matter of law for as long as the Act stands. For a treasury or risk function pricing settlement and storage exposure, that puts a sovereign guarantor in front of the obligations tied to the metal.
Set against those protections, the same ownership brings obligations. Gold Corporation is a regulated reporting entity under Australia’s Anti-Money Laundering and Counter-Terrorism Financing Act 2006, supervised by AUSTRAC, and it operates under the State prudential guidelines that apply to a government-owned body. Ownership by the State raises the scrutiny the entity answers to and confers no exemption from the AML/CTF regime. That places Gold Corporation in the register of AUSTRAC-reporting entities and under Western Australian prudential oversight — a defined legal and compliance status, recorded publicly.
History: from Royal Mint branch to Australia’s bullion refiner
In a provenance file, an institution’s age measures something specific: the length of the record a counterparty can check, and the reason a mark is recognised on sight. The Perth Mint has refined and sold gold continuously since 1899. Ownership has transferred once in that time — from the British Crown to the State of Western Australia — and each step is documented. Its assaying competence is as old as the mint itself, and the accreditations it holds today rest on that foundation.
Founding and the gold-rush mandate (1896–1899)
On 20 June 1899 the Perth Mint opened as the third branch of Britain’s Royal Mint in Australia, after Sydney and Melbourne. Both of those mints have since closed. Western Australia’s first Premier, John Forrest, had lobbied London for a branch to serve the goldfields opening at Kalgoorlie and Coolgardie, and he laid the foundation stone in 1896. The mandate was direct: mining operations sold raw gold to the mint, which assayed it and struck it into sovereigns and bullion to a standard the market already trusted. By 1931 the mint had struck more than 106 million gold sovereigns for circulation. Converting unrefined gold into standardised, hallmarked metal — the function that defines the institution today — was its founding business, and its assay discipline dates from the same year.
From British control to Western Australian ownership (1970–1987)
For 69 years after Australian Federation the mint stayed under British control. Ownership passed to the Government of Western Australia on 1 July 1970, and the institution was reconstituted as the Western Australian Mint under the Perth Mint Act 1970. The State formed GoldCorp Australia in 1986 to redevelop the mint and market a government-backed bullion programme internationally; the Gold Corporation Act followed in 1987. In 1988 the Western Australian Mint and GoldCorp Australia became subsidiaries of a new holding company, Gold Corporation. That 1988 reorganisation created the legal entity the brand trades under and set the statutory guarantee over its liabilities.
Refinery consolidation (1990s–present)
From 1995 onward, four formerly separate LBMA-accredited Australian refiners folded into one operation: Australian Gold Refineries, Johnson Matthey (Australia), Golden West Refining, and Harringtons Metallurgists. Their capacity and accreditation lineage consolidated into a single accountable refiner. That refining work runs from a dedicated plant near Perth Airport; the historic Hay Street building serves as the public and retail face. The consolidation closed one chapter and opened another: four refiner identities became one, and a Perth Mint bar now traces to a single operation answerable for the mark.
Production: refining scale, accreditations, and bar formats
Now the largest single processor of newly mined gold in the world, the operation turns scale into trade through two things a buyer checks: the accreditation that lets a bar move, and the format that fixes where it settles. Scale by itself settles nothing.
Refining scale and feedstock
Around 71% of Australia’s newly mined gold is refined at this one site. Capacity runs beyond 800 tonnes of gold and 1,000 tonnes of silver a year, and in 2024-25 the refinery processed 225.4 tonnes of gold for its resources-industry customers. Turnover for the same year reached AUD 32.95 billion, placing Gold Corporation among Western Australia’s largest exporters and manufacturers. The scale fixes how much of the world’s recognised bullion traces back through one accountable refiner.
In FY2024-25 the refinery accepted lodgements from 49 large-scale mines, accounting for 98.8% of its gold supply, with a further 0.66% from Australian secondary sources such as licensed second-hand dealers. Sourcing disclosures of this kind make the feedstock checkable. Cash transactions are prohibited, and all payments run through official banking channels. By the refinery’s own count, 98.8% of the metal entering a Perth Mint bar is large-scale mined doré moving through an audited supply chain.
Accreditations and referee status
On the LBMA Good Delivery List, the Perth Mint refinery is accredited for both gold and silver, and it meets the requirements of the major bullion exchanges — the LBMA, COMEX, the Shanghai Gold Exchange, the Osaka Exchange, and the Dubai Multi Commodities Centre — as a refiner, weight master, and assayer. Accreditation draws the line between a bar that clears at value and one that must be re-assayed before anyone takes it. In wholesale trade, Good Delivery status does the heavy lifting: it lets a Good Delivery gold bar pass between counterparties at stated weight and fineness without independent re-assay.
The referee role goes a step beyond holding accreditation. The Perth Mint is one of only seven global referees appointed by the LBMA: its assay laboratory polices the standard, assaying samples submitted by other Good Delivery refiners as part of proactive monitoring and supplying the reference samples the market calibrates against. That places the mint among the small group of laboratories the LBMA relies on to adjudicate other refiners’ metal — an accreditation status held by six others worldwide.
Cast and minted bar formats
Format decides where a bar can go. The mint runs a standard range of 13 cast and 7 minted gold bars, alongside bespoke production for external entities, and the two methods map onto two settlement worlds. Cast bars are poured into a mould and carry the slightly irregular surface that follows; they run to the large wholesale sizes that move between vaults and exchanges. Minted bars are cut from rolled sheet, pressed, and sealed in a certified card; they run to the smaller denominations an individual buyer or family office holds and verifies directly.
The formats that matter most for institutional allocation sit at the predictable points:
| Format | Method | Typical fineness | Where it settles |
|---|---|---|---|
| 400 oz (~12.5 kg) | Cast | LBMA Good Delivery, min. 995.0 | Wholesale settlement, exchange delivery, vault holdings. Produced to Good Delivery standard since March 2010. |
| 1 kg | Cast | 999.9 | Institutional and family-office allocation; the kilobar is the format at the centre of the 2021 Shanghai purity episode below. |
| 100 oz / 50 oz | Cast | 999.9 | Mid-size allocation where the 400 oz bar is too large to subdivide. |
| 1 g – 1 kg | Minted | 999.9 | Smaller-denomination holdings, sealed in tamper-evident certificate cards for individual verification. |
The 400 oz cast bar follows the LBMA Good Delivery specification: a serial number, the refiner’s hallmark, the fineness, and the year of manufacture, at a minimum fineness of 995.0 and a weight between 350 and 430 troy ounces. The full range of investment bar formats and their specifications sit on the dedicated bar pages. The selection rule is simple: large, high-purity wholesale needs take the cast Good Delivery bar, and smaller, independently verifiable holdings take the minted bar.
Authentication: marks, packaging, and verification
A Perth Mint bar carries its authentication in three layers, and a holder reads them in sequence. The marks struck into the metal come first, and they are the only layer common to every bar. Sealed packaging adds a second layer on the smaller minted formats. Independent confirmation is the third, the backstop when either of the first two is in question. Each layer works the same way: it ties the bar to records the refiner keeps, and that record is where verification finally lands.
Bar markings and the Good Delivery baseline
Before any acid or ultrasound touches the metal, a bar clears or fails on what is stamped into its surface. An LBMA Good Delivery bar carries four marks — a unique serial number, the refiner’s hallmark, the fineness, and the year of manufacture. Each answers a different question. The serial number indexes the individual bar to the refiner’s production records and underwrites insurance and theft-recovery claims; the refiner’s hallmark — on a Perth Mint bar, the swan device that appears in the logo on the face of the bar — names the accountable producer; the fineness states the purity claim being made; and the year dates it. A counterparty, assayer, or vault reads these four first, and a bar that is missing one or carries an inconsistency between them fails at the documentary gate before its metal is ever tested. The serial is the load-bearing mark: the hook through which every later check — against the assay record, the packaging, or the refiner’s files — reaches the right bar.
Tamper-evident packaging and certificates
On the smaller minted bars an individual buyer or family office holds, the packaging does authentication work. A Perth Mint minted bar is sealed in a tamper-evident certificate card — the CertiCard — that shows the word VOID around the blister once it is prised open, and the serial number is printed on the card and laser-etched onto the bar on one-ounce and larger formats, so the two read as a matched pair. Intact, with serials agreeing, the sealed card lets a buyer accept the bar on inspection alone. A broken seal or diverging serials sends the bar back to assay or refiner confirmation. Large cast wholesale bars take a different route: their verification basis is the struck marks plus an unbroken Good Delivery chain of custody between accredited vaults.
Independent verification and its limits
Confirming a serial runs through a defined route. The Perth Mint verifies through matching marks and packaging, and, where doubt remains, through its customer-care channel or a professional assayer; it offers no self-service online checker. Some refiners back each bar with a scannable database record a dealer can query on the spot, so the contrast is worth naming. It matters because the packaging itself is forged: documented counterfeit Perth Mint assay cards exist, separable from genuine ones only by millimetre differences in layout and serial-box placement. Independent verification of a Perth Mint bar therefore resolves to a documentary match against the refiner’s records, closing on a physical assay where records and metal are reconciled. The confirmation rests on the records the refiner holds — the same records the episodes below put to the test.
Provenance integrity and compliance record
Accreditation and a bar’s marks describe the system working as intended. A current provenance file also records the occasions it failed. Across 2018–2023 the Perth Mint was tested on two fronts — bar composition and anti-money-laundering controls — and both ran through independent review to a documented resolution. Both episodes left the purity and value of the gold a holder owns intact, and both inform how a counterparty weights the institution itself.
In March 2023 an ABC Four Corners investigation reported that from 2018 the mint had “doped” the non-gold fraction of one-kilogram bars sold to the Shanghai Gold Exchange, with an estimated 100 tonnes — valued in the reporting at around AUD 9 billion — said to fall outside the exchange’s specification. The composition question was narrow. The mint’s position was that the bars held at least 99.99% gold and met the LBMA standard; the breach lay in the SGE’s tighter sub-rule, which caps silver within the permitted 0.01% non-gold portion at 50 parts per million. Internal documents cited in the investigation indicated the breach went undisclosed to the exchange after staff raised concerns, and the SGE itself flagged the two non-conforming bars in September 2021. The LBMA opened its Incident Review Process in March 2023 and, on completion, retained the Perth Mint on the Good Delivery List subject to a third-party-audited Corrective Action Plan, recording that the credibility of the mint’s assay laboratory was never in question.
AUSTRAC took up the anti-money-laundering side, and it reached further back. Between November 2022 and July 2023 an external audit it ordered identified compliance issues in the mint’s ongoing customer due diligence, suspicious-matter reporting, and enrolment obligations. In November 2023 the mint entered a voluntary Enforceable Undertaking, with no fine imposed, committing to an AML remediation programme it had begun in 2021. AUSTRAC released it from the undertaking on 22 July 2025, after an external auditor’s final report confirmed the remediation was complete; by then the programme had remediated close to 70,000 customer records and rebuilt the onboarding and monitoring processes. A 2020 review, prompted by reporting on gold sourced from Papua New Guinea, had already led the mint to cease that sourcing and pass a renewed LBMA responsible-sourcing audit.
For provenance diligence, the resolved record is a specific, checkable signal. Through both matters the bars’ gold content held, the assay laboratory’s credibility held, and the Good Delivery accreditation was retained; the failings sat in sourcing disclosure and client-onboarding governance, and each was closed out by the relevant authority on the record. The sovereign guarantee under the Gold Corporation Act applied to the entity throughout. As of the latest public record, the position is documented and current: the Perth Mint remains on the LBMA Good Delivery List, the Corrective Action Plan ran under third-party audit, and AUSTRAC released the Enforceable Undertaking on 22 July 2025 with the remediation programme complete.
Where Perth Mint metal fits in institutional sourcing
Refiner identity is one input in a sourcing decision. A buyer reconciles several at once: the refiner’s accreditation and current status, the bar format against the intended use, the fineness the contract calls for, and an unbroken chain of custody from refinery to delivery. A Perth Mint bar answers the first cleanly — a Good Delivery refiner with marks and packaging that support verification, and a compliance record now closed on the public file. The rest depends on the holding’s size and where the metal has to sit and move.
Refiner origin belongs at the front of the workflow. It establishes what the bar claims and that the claim clears in wholesale trade; the live questions that follow are format and custody — which bar size the allocation calls for, and how the chain is documented from refinery to vault. Those questions are settled at acquisition. They close when the metal is acquired as a physical holding, with the bar format chosen and the chain of custody documented from refinery to vault.