No. A 2024 study did not announce a new iron ore discovery or value a deposit at $5.7 trillion. It directly dated hematite in known giant deposits in Western Australia’s Hamersley Province, finding that the major preserved deposits formed about 1.4–1.1 billion years ago. The $5.7 trillion figure comes from separate headline arithmetic, not from the study’s findings.
What geologists actually found
The peer-reviewed study, “A billion-year shift in the formation of Earth’s largest ore deposits,” was published in Proceedings of the National Academy of Sciences (PNAS) on July 23, 2024. It examined already known deposits in the Hamersley Province, part of Western Australia’s Pilbara Craton. The contribution was a revised timeline for how the deposits formed—not the discovery of a previously unknown ore body. Read the PNAS study.
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The researchers used uranium–lead geochronology to date hematite grains directly. Their central result is that the major preserved Hamersley hematite deposits formed between 1.4 and 1.1 billion years ago. A combined date for a Mt. Tom Price hematite intercept was 1,387 ± 30 million years, based on 105 analyses. The paper also reports that samples from the cited martite–microplaty hematite deposits contain more than 64% iron by weight; these are study-specific geological observations, not a new estimate of recoverable tonnage.
How the two geological ages differ
| Evidence | What the study reports | What it means |
|---|---|---|
| Older episode | 2.2–2.0 billion years ago | Hematite ore clasts record an earlier mineralizing episode. The authors describe much of this older mineralization as now largely eroded. |
| Major preserved deposits | 1.4–1.1 billion years ago | The direct dating places formation of the major preserved Hamersley hematite deposits in this younger interval. |
| Mt. Tom Price intercept | 1,387 ± 30 million years; 105 analyses | A specific combined hematite date reported in the study, not an age for every ore deposit. |
The distinction matters: the study is about when iron-rich hematite enrichment took place, not when all of the region’s iron-bearing material was first deposited. Banded iron formations are older, layered sedimentary rocks that provided iron-rich material for later geological processes.
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Why the authors think the deposits formed
The authors link the younger 1.4–1.1-billion-year interval to tectonic assembly of Australia after the breakup of the Columbia supercontinent. Their interpretation is that large-scale tectonic activity could have supplied energy and directed hydrothermal fluids, helping enrich older banded iron formations into giant, high-grade hematite deposits. This is a proposed geological explanation, not a mechanism established as the only cause.
Curtin University’s contemporaneous summary described the work as a new date for Earth’s largest iron deposits and said it may help guide future exploration. Lead author Dr Liam Courtney-Davies said: “By using an emerging technique to date iron oxide minerals through uranium and lead isotope analysis within the mineral grains, we directly dated all the major giant BIF-hosted iron ore deposits in the Hamersley Province.” Read Curtin University’s summary.
Where the $5.7 trillion figure comes from
The figure is attributed to a 2025 Indian Defence Review article, which asserts a quantity of 55 billion metric tons and calculates $5.775 trillion by multiplying that quantity by an assumed price of $105 per ton. Those are secondary-source claims; the PNAS paper does not establish the 55-billion-tonne figure or publish a valuation. See the article behind the headline calculation.
That multiplication is a theoretical gross in-ground calculation, not a reserve valuation. It does not show that all the material can be mined, processed, recovered, or sold at that price. The price assumption is not a guaranteed sale price, and the arithmetic does not account for extraction costs, infrastructure, processing, financing, permitting, or market conditions.
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Why a tonnage claim is not the same as an economic reserve
Geoscience Australia explains that iron ore is rock from which metallic iron can be economically extracted; deposit types, grades, and commercial viability vary. A geological occurrence, an identified resource, and an economically mineable reserve are not interchangeable categories. Establishing a reserve requires evidence about quantity and quality as well as the technical and economic conditions for extraction. Geoscience Australia’s iron overview.
Geoscience Australia says Western Australia contains about 90% of Australia’s identified iron ore resources and the Hamersley Province almost 80%. These figures describe Australia’s identified resources; they do not validate the secondary article’s 55-billion-tonne figure as an economic reserve for the deposits dated in the PNAS study.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the study can—and cannot—tell investors
The study provides evidence about the geological timing and possible formation processes of major known deposits. Better understanding of how deposits formed may inform future exploration, but the paper is not a project feasibility study, resource statement, reserve report, or forecast of future iron prices or mining profits.
Quick Recap
- Established by the paper: direct hematite dating places the major preserved Hamersley deposits at 1.4–1.1 billion years old, with evidence of an older 2.2–2.0-billion-year mineralizing episode.
- Not established by the paper: a new discovery, a verified 55-billion-tonne economic reserve, or a $5.7 trillion market value.
- Practical takeaway: treat the dollar figure as attributed headline arithmetic, not as a measure of a company’s asset value, a government valuation, or a forecast of money that mining could generate.
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