Introduction: facts and hypotheses
By the early 1970s, silver was more than a monetary and jewellery metal. It served electronics, electrical contacts, photography, aerospace and high-energy batteries. General Motors had built the silver–zinc-powered Electrovair I and II in the 1960s; GM's account gives Electrovair II a 450 V battery, a top speed of 80 mph and 40–80 miles of range.[1]
NASA and its contractors had also spent years improving Ag–Zn cycle life. High specific energy was established, but repeated use was limited by zinc-electrode degradation and shape change, separator damage, cost and comparatively short life.[2]
The oil crisis and government support for electric vehicles
In autumn 1973, Arab oil exporters imposed an embargo on the United States and several allies of Israel. By January 1974, oil prices had risen from roughly $2.90 to $11.65 per barrel, almost fourfold. Western countries saw how dependent transport and industry were on liquid fuels.[3][4]
The United States passed the Electric and Hybrid Vehicle Research, Development, and Demonstration Act in 1976. It directed ERDA to organise research and demonstration programmes, develop vehicle requirements and procure thousands of vehicles for federal testing.[5]
Major energy companies investigated alternative storage as well. At Exxon, Stanley Whittingham developed a rechargeable lithium system with a TiS₂ cathode and published lithium-intercalation research in 1976.[6][7] The distinction matters: the electrode material was solid, but the electrolyte was liquid. This was a major lithium-battery milestone, not a modern solid-state cell.
Improving silver–zinc batteries
By the 1970s, Ag–Zn research addressed lifetime, separators, sealing, cost and zinc stability rather than basic feasibility. NASA reports that by 1972, improved inorganic separators enabled approximately 400–500 shallow cycles while retaining a substantial size advantage over nickel–cadmium batteries. Depth of discharge and test conditions were crucial, so these figures cannot be treated as automotive lifetime data.[2]
In 1977, Lear and Imamura reported a sealed Ag–Zn battery exceeding 350 cycles at 40% depth of discharge in a simulated synchronous-orbit regime; another battery without individual-cell control failed after 270 cycles.[8] In 1979, NASA described cheaper inorganic–organic separators with comparable or better cycle life at roughly one-quarter of the previous manufacturing cost.[9]
These results demonstrate technical progress, not the imminent arrival of a mass-market silver–zinc EV. They help explain why Ag–Zn could look promising in the mid-to-late 1970s while remaining expensive and life-limited.
23 May 1978: two different Ag–Zn development paths
Two US patents on rechargeable silver–zinc batteries were published on the same day. Their different objectives illustrate the period's research.
US4091184: a high-power bipolar battery
Patent US4091184, filed on 19 August 1977 and assigned to the US Air Force, described a stack of bipolar cells. Silver foil supported active material and connected adjacent cells, reducing intercell resistance. The proposed design addressed very high-current applications, and the text referred to military power systems.[10]
It was not a civilian EV patent. It shows Ag–Zn being considered as a rechargeable high-power source, with work focused on packaging, resistance and pack scaling. Applying similar principles to transport or other civilian uses is an engineering analogy, not the inventors' stated objective.
US4091193: removing mercury from the zinc electrode
Patent US4091193, filed on 31 March 1977, addressed another practical issue. Mercury oxide had been used in zinc electrodes to limit hydrogen generation. The authors highlighted the toxicity of mercury vapour and salts, particularly in enclosed spaces such as submarines.[11]
The proposed alternative was a lead-oxide additive. It reduced gas generation without mercury, but did not make the battery wholly safe or environmentally benign: lead compounds are toxic too. The patent addressed a specific mercury hazard that was particularly undesirable in enclosed spaces and prospective civilian uses.[11]
Solid-state batteries already existed around 1970
Solid-electrolyte battery concepts long predate modern SSBs. Standard Oil patents US3506490 and US3506492, filed in May 1968 and published in April 1970, described rechargeable systems with lithium or lithium-alloy anodes and lithium salts retained within a solid matrix.[12][13]
The inventors explicitly linked the work to less-polluting automotive propulsion and claimed high specific energy and relatively rapid charging.[12] These were not modern room-temperature SSBs, however: they operated at high temperature, with possible molten-salt regions within the solid matrix.
Possible anodes included Li–Ag alongside Li–Al, Li–In, Li–Sn, Li–Pb and Li–Cu, although Li–Al was preferred.[12] Lithium–silver anodes were therefore already present in the early solid-state patent landscape.
The 1977 paper A review of silver, copper and lithium solid-state power sources documents the breadth of interest in solid-state cells and fast-ion conductors.[14] Silver and lithium systems were mainly neighbouring research directions, not one unified architecture.
1973: silver appears in a proposal to suppress lithium dendrites
P. R. Mallory filed patent US3953302, Prevention of dendritic plating of lithium, on 16 August 1973; it was published in 1976. It proposed metal compounds in a liquid non-aqueous electrolyte that could co-deposit with lithium, forming lithium-rich alloys or intermetallics. The authors attributed reduced dendritic growth to the resulting change in deposition morphology.[15]
Silver appeared explicitly among the proposed metals. By 1973, the general idea therefore existed that a noble metal capable of alloying with lithium might guide its deposition and inhibit dendrites.[15]
The evidential limits matter. Practical examples mainly used calcium, zinc and mercury compounds; no separate silver experiment was presented. The patent establishes the idea's presence, not an experimentally demonstrated silver technology.
1979: Arabinda N. Dey and a specific Li–Ag anode
Stronger evidence came from Arabinda N. Dey's work for Duracell. The application that became US4316777 had priority from 1 October 1979, with related patent US4330601 later divided from it. Both were granted in 1982, so this is a 1979 development, not a patent published in the 1970s.[16][17]
Dey proposed a solid Li–Ag anode alloy or a porous silver host on which lithium plated during charging and formed a solid solution. The documents stated that this approach suppressed dendrites while preserving mechanical integrity.[16]
The described mechanism was specific:
- lithium deposits on a silver surface and alloys with it;
- porous silver increases available area and promotes more uniform deposition;
- if deposition exceeds the rate at which lithium enters the alloy, unalloyed metal can again form dendritic and loose deposits.
This directly documents deliberate use of silver to manage repeated lithium deposition by late 1979.[16]
From technological context to an investment hypothesis
By the late 1970s, public literature covered improved Ag–Zn cells, early solid-state sources, lithium intercalation, dendrite research and a specific Li–Ag anode.
Silver appeared in distinct roles: Ag–Zn active material, an ionic conductor in silver solid-state systems, a conductive metal and a lithium-alloy constituent.
This does not establish enormous future demand. Some systems were military or aerospace designs, some operated at high temperature, others used little silver, and many never reached mass markets. Nevertheless, an informed commodity investor could have recognised energy storage as a strategic field in which silver appeared repeatedly.
The rest of this article asks a more cautious question: could that technological background have reinforced the Hunts' position alongside the better-documented motives of inflation, currency risk, restricted supply and a preference for physical assets?
The origins of the Hunt fortune
Haroldson Lafayette Hunt, H. L. Hunt, built the family fortune. In 1930, he acquired the Daisy Bradford No. 3 well and neighbouring acreage in the emerging East Texas oil field, financing much of the price from future production. By 1932, his businesses controlled about 900 wells; operations later centred on Hunt Oil.[18][19]
In 1948, Fortune called Hunt the wealthiest American, estimating oil assets at approximately $263 million and daily production at 65,000 barrels.[19] The family's business included exploration, production, infrastructure, finance and international projects, rather than passive inheritance alone.
Nelson Bunker Hunt and William Herbert Hunt inherited substantial capital, specialist access and international connections. Bunker developed oil projects abroad. In later public explanations, he identified the nationalisation of Libyan assets in 1973 as one reason to seek wealth less vulnerable to confiscation alongside a foreign concession.[20]
Experienced commodity participants
It is too simplistic to portray the Hunts as novices who heard a tip about silver and committed their fortune without analysis. Their business had long depended on evaluating reserves, long-term prices, political risk, infrastructure and commodity contracts. They could make mistakes, as the outcome showed, but the scale suggests a deliberate strategy rather than an incidental purchase.
Their oil and financial networks may have exposed them to energy and battery developments before the wider public. However, no direct letter, investment memorandum or testimony linking their silver purchases to batteries has been identified in the material examined.
Why silver?
Their first large purchases date to 1973. TIME reported that after Libyan nationalisation, Bunker and Herbert acquired futures positions representing about 35 million ounces at around $3.[20]
There were clear financial reasons. Silver was accessible to private investors, its market was relatively small, it could be held physically, and it combined monetary history with established industrial demand from photography, electronics, contacts, soldering and chemicals.
Silver combined an asset held for protection with an industrial material. Much was mined as a by-product of lead, zinc and copper, so supply might not respond quickly to new demand. Oil entrepreneurs familiar with the slow response of extraction capacity could have found that asymmetry attractive.
A position in physical metal as well as price
The Hunts went beyond futures. A CFTC review records that by autumn 1979, the group held more than 43 million ounces of physical silver and over 12,000 March contracts representing potential delivery of another 60 million ounces.[21]
They continued taking delivery and monitored whether metal they already owned was returned through settlements on other contracts. Contemporary accounts also described substantial Swiss storage. This reduced exchange-available supply while insulating holdings from some intermediary, rule-change and domestic-policy risks.[20][21]
Physical ownership fits several motives: inflation fears, distrust of financial institutions, expected shortages and greater market influence. It cannot by itself distinguish among them.
Arab partners and IMIC
Popular accounts often say ‘the Saudis’ joined the Hunts; private Arab investors is more precise. International Metals Investment Company, IMIC, was incorporated in Bermuda in 1979 and associated with Bunker and Herbert Hunt and Middle Eastern participants. Court records identify Saudi businessman Mahmoud Fustok among them.[22]
No evidence of a Saudi government operation has been identified here. Nor has a published study established that the partners specifically anticipated silver demand from batteries. They may have analysed inflation, metal supply and political risks, but those analyses are not available.
Seeking future mine production
Actions beyond the exchange support a longer planning horizon. In 1977, Hunt-linked interests sought control of Sunshine Mining, then the largest US silver-mining company.[23]
The Hunts also financed Prairie Creek, a Canadian lead–zinc–silver project with a mine and processing plant. It was nearly ready when falling prices and financial crisis halted work shortly before production.[24]
A mine requires years of investment and targets future metal flows, making it difficult to reconcile with a purely short-term position. Yet it also fits an ordinary expectation of prolonged inflation or constrained supply. Technological demand remains only one possible explanation.
The possible thesis need not have concerned one battery
If a technological motive existed, there is no reason to reduce it to one silver–zinc car. The late 1970s saw Ag–Zn, lithium-metal and intercalation systems, sodium–sulfur batteries, fuel cells, solid electrolytes, solar power and power electronics. D. A. J. Rand's review linked traction-battery research to the oil crisis and discussed competing chemistries.[25]
Public documents place silver among possible anti-dendrite additives in 1973 and in a specific Li–Ag anode with 1979 priority.[15][16]
What supports the technology hypothesis?
First: the Hunts came from the oil industry, where EVs and alternative storage became strategic subjects after 1973. Banks, contractors, conferences and business partners could have provided information.
Second: silver combined a monetary role, established industrial consumption and possible new applications, potentially a broader thesis than inflation alone.
Third: physical delivery, offshore storage and efforts to keep holdings out of circulation are consistent with expecting scarcity, although their own actions also intensified it.
Fourth: Sunshine Mining and Prairie Creek indicate interest in future production beyond short-term contracts.
Fifth: the technology wave was visible without confidential information. Government EV programmes, NASA reports, Ag–Zn patents, early SSB work and Li–Ag research were public.[5][8][10][14][16]
What the hypothesis does not explain
The central problem is the absence of direct evidence. Regulatory accounts did not describe the Hunts as silver producers, processors or users; the CFTC explicitly characterised them as speculators without an industrial need for the metal.[21]
The leverage, concentrated positions and coordinated purchases of 1979–1980 also went well beyond an ordinary long-term materials investment. Even a reasonable thesis about future demand would not change how its implementation developed into an attempt to control available supply and price.
Technical documents did not promise inevitable mass silver use. Ag–Zn remained expensive and life-limited, Li–Ag might require only a thin or porous silver component, and many early SSBs operated at high temperature. An investor could recognise a storage revolution while misjudging the winning chemistry and material demand.
From a fundamental thesis to a market frenzy
Silver traded at around $6 per ounce in January 1979. By autumn it exceeded $9, then moved into the $15–18 range before reaching $48.70 on 17 January 1980.[21]
Exchanges raised margin requirements and restricted position concentration. On 21 January, COMEX introduced liquidation-only trading, restricting new long positions. With heavy reliance on borrowed funds, this changed market dynamics sharply. Senate hearings and subsequent interagency work examined the participants' and exchanges' actions in detail.[21][26][27]
On 27 March 1980, Silver Thursday, the price fell to around $11. The Hunts could not meet collateral demands on time, exposing brokers and banks to default risk. The later official review concluded that converting large futures positions into physical metal contributed to both the rise and the collapse.[21]
Why is evidence of a technology motive missing?
One possibility is that, after the collapse, explanations centred on inflation and misplaced confidence in silver were legally preferable to discussion of coordination, private information or more complex analyses. No document establishing a planned public-defence strategy has been identified, however.
In 1988, a jury found Nelson Bunker Hunt, William Herbert Hunt, Lamar Hunt, Mahmoud Fustok and IMIC liable on claims involving the Commodity Exchange Act, antitrust law and fraud. The judgment exceeded $132 million.[28]
The cited case concerned civil liability. Financial consequences included bankruptcies, years of litigation, penalties and restrictions on commodity trading. Suggestions that admitting use of inside information would have led to criminal liability remain hypothetical; the cited civil case does not establish that counterfactual.
1980: silver falls as lithium takes a major step
In June 1980, Koichi Mizushima, Philip Jones, Philip Wiseman and John Goodenough published work on LiCoO₂ as a high-energy cathode. Its voltage against lithium metal was roughly twice that of the TiS₂ system.[29]
This did not instantly create modern lithium-ion, but was decisive. Akira Yoshino later combined Goodenough's cathode direction with a safer carbon anode, and commercial lithium-ion batteries arrived in 1991.[30]
For the Hunt hypothesis, this has two implications. A late-1970s battery breakthrough could indeed reshape materials demand, but the winning system was uncertain. Even an informed observer could correctly anticipate an energy transition while misjudging its timing and scale.
Conclusion: substantial technical context, an unproven motive
Documents show intensive battery research in the 1970s. Developers sought longer-lived, more powerful and safer Ag–Zn systems; early solid-state cells were considered for traction; and lithium dendrites were a recognised problem. Silver appeared first in broad lists of deposition-modifying metals, then in a specific 1979-priority Li–Ag design intended to reduce dendritic and loose deposits.
The record also establishes the Hunts' commodity experience, preference for physical metal, international partnerships with private Arab investors and investment in future mining. An account in which they chose silver randomly without considering industrial prospects is therefore overly simple.
Nelson Bunker Hunt died on 21 October 2014, aged 88. William Herbert Hunt died on 9 April 2024, aged 95. The silver collapse did not end the family's business activity: Hunt companies continued operating, and Herbert rebuilt substantial wealth in later decades. No public comments by the brothers or their heirs directly confirming a battery-technology motive have been identified in the sources examined.
The most defensible conclusion remains qualified. The Hunts may have recognised that oil crises were accelerating electric transport research and that silver repeatedly appeared among prospective battery materials. There is still no direct evidence that this technological picture motivated their silver operation.
Commercial solid-state batteries may eventually encourage a fresh perspective on the late 1970s. If silver becomes important in next-generation storage, one could reconsider the Hunts' position as an extremely early, destructively implemented anticipation of an energy transition. That remains a retrospective hypothesis, not proof of their intentions.
They may have recognised a direction of technological change while misjudging its timing, demand and the means of pursuing it. On that interpretation, the story concerns investors who anticipated a possible future too early and tried to accelerate it through capital. The documentary gap remains essential to the argument.
Sources and documents
- General Motors Research: Electrovair and silver–zinc batteries
- NASA Spinoff: rechargeable Ag–Zn cycle-life research
- US Department of State: the 1973–1974 oil embargo
- Federal Reserve History: oil-shock prices and consequences
- Congress.gov: Electric and Hybrid Vehicle Research, Development, and Demonstration Act of 1976
- M. S. Whittingham, Electrical Energy Storage and Intercalation Chemistry, 1976
- ExxonMobil: Stanley Whittingham's work at Exxon
- NASA NTRS: Lear and Imamura, sealed Ag–Zn cell life, 1977
- NASA TP-1476: low-cost rechargeable Ag–Zn separators, 1979
- US4091184: High power, rechargeable, pile type silver zinc battery
- US4091193: Rechargeable silver-zinc batteries — replacing HgO with lead oxides
- US3506490: Solid electrolyte battery having lithium or lithium alloy anode
- US3506492: an early solid-state battery with a lithium or alloy anode
- Lazzari, Scrosati: A review of silver, copper and lithium solid-state power sources, 1977
- US3953302: Prevention of dendritic plating of lithium
- US4316777: Rechargeable nonaqueous silver alloy anode cell
- US4330601: Dey's related silver-alloy anode patent
- Hunt Oil Company: company history
- Texas State Historical Association: H. L. Hunt's biography
- TIME, 14 January 1980: the Hunts' silver position
- CFTC: review of the silver episode, deliveries and concentrated positions
- MINPECO v. Conticommodity, 1987: IMIC and the participants
- The Washington Post, 1977: the Sunshine Mining control attempt
- Canadian Mining Journal: the Hunts and Prairie Creek
- D. A. J. Rand: a review of EV battery systems, 1979
- US Senate silver-market hearings, 1980, Part I
- US Senate silver-market hearings, 1980, Part II
- MINPECO v. Hunt, 1989: verdict, RICO and the judgment exceeding $132 million
- Mizushima, Jones, Wiseman, Goodenough: LiCoO₂, 1980
- Nobel Prize: lithium-ion development from Whittingham and Goodenough to Yoshino