Will gold’s ‘infinite mint bug’ make Bitcoin more valuable?

A US fusion startup, Marathon Fusion, announced that it has produced stable gold by transmuting mercury‑198 using neutrons from a deuterium‑tritium fusion reaction. The claim was made on 30 October 2026 and quickly sparked debate about whether an “infinite mint bug” for gold could affect Bitcoin’s status as digital gold. Coinbase chief executive Brian Armstrong and Marathon co‑founder Kyle Schiller were quoted, while metals‑research director Nikos Kavalis warned the output remains microscopic.

Background

Gold has long been prized for its scarcity, a characteristic that underpins its role as a store of value and the basis for Bitcoin’s “digital gold” narrative. Marathon Fusion’s approach differs from traditional mining because it relies on nuclear transmutation rather than chemical extraction. The process uses high‑energy neutrons generated in a deuterium‑tritium fusion reaction to irradiate mercury‑198, creating a radioactive isotope that decays into stable gold‑197. The company released a research paper describing the physics and projected that a future fusion plant could generate about two tonnes of gold per gigawatt of thermal fusion power each year. By comparison, the World Gold Council reported global mine production of 3,672 tonnes in 2025. Experts such as Nikos Kavalis of Metals Focus and Marathon engineer Jake Harter emphasized that current yields are microscopic, with plans only to reach milligram‑scale quantities by 2027. The announcement coincided with broader market stress, as Bitcoin fell below $80,000 and gold slipped to its lowest price since October 2025, reflecting a wider risk‑asset sell‑off.

What happened

On 30 October 2026 Marathon Fusion published a research paper stating that neutrons from a deuterium‑tritium fusion reaction can irradiate mercury‑198, producing a radioactive isotope that decays into stable gold‑197 (Source 1). The company claimed its method produced stable gold at a rate ten times the CERN ALICE experiment’s record, though CERN’s run only yielded an estimated 29 picograms of gold nuclei that existed for fractions of a second (Source 1). Marathon research engineer Jake Harter said the quantities produced remain “microscopic” and that the firm hopes to achieve “macroscopic milligram quantities in 2027” (Source 1, Source 2). The paper models future output of roughly two tonnes of gold per gigawatt of thermal fusion power annually, which would be modest compared with the 3,672 tonnes mined globally in 2025 (Source 1, Source 3). Coinbase CEO Brian Armstrong compared the development to lab‑grown diamonds, noting that Bitcoin’s supply cannot be expanded and will remain capped at 21 million coins (Source 1, Source 2, Source 3). Marathon co‑founder Kyle Schiller said jewelers have shown “shocking” interest and that the gold would likely be used as a store of value, echoing traditional gold’s role (Source 1, Source 2). Metals‑focus managing director Nikos Kavalis warned that the technology is “nowhere near a stage where we can talk about production significance” and that gold miners are unlikely to lose jobs in the near term (Source 1, Source 2, Source 3). Meanwhile, broader market data showed Bitcoin trading around $77,000 and gold at $3,891 per ounce, its weakest level in a year, as tech‑sector fears drove a risk‑asset rout (Source 4).

Market impact

Bitcoin slipped below $80,000 on the day of the announcement, hovering around $77,000 and on track for a 7.7% monthly decline, its worst October performance since 2014 (Source 4). Gold prices fell to $3,891 per ounce, the lowest level since October 2025 (Source 4). No direct price movement was attributed to Marathon’s claim, but the juxtaposition of a potential new gold supply and a falling gold price highlighted market sensitivity. The announcement did not trigger any immediate large‑scale gold purchases or sales, and Marathon has not disclosed the exact amount of gold produced, only that current yields are microscopic (Source 1, Source 2). Analysts such as Brian Armstrong emphasized Bitcoin’s fixed 21 million coin supply, suggesting the digital asset’s scarcity remains untouched by physical‑commodity developments (Source 1).

Why it matters

The claim introduces a theoretical pathway for augmenting gold supply without traditional mining, which could, if scaled, pressure gold prices and challenge its scarcity narrative. However, experts stress that the technology is years away from industrial relevance, with milligram‑scale production not expected until 2027 and gigawatt‑scale plants still speculative. Bitcoin’s value proposition as digital gold rests on its immutable 21 million cap; the inability to increase its supply means that any future gold‑supply changes are unlikely to directly affect Bitcoin’s scarcity. Nonetheless, the comparison made by Coinbase’s Brian Armstrong and the media’s framing of the story may reinforce Bitcoin’s positioning as a hedge against physical‑commodity volatility, especially as gold prices dip amid broader market stress.