Newsletter · · Ashutosh Agarwal

Record Diesel, $14,000 Copper, and November's Rare-Earth Clock - Materials Weekly - Week of September 20, 2026

A weekly plain-English podcast read on metals, critical minerals, and agricultural inputs for the week of September 20, 2026 (episodes from September 13 to September 20). Covers copper at a record near $14,000 a tonne, diesel hitting an all-time high of $6.40 a gallon at harvest, the one-year rare-earth truce with China running out in November, and the $12 billion VaultCo critical-minerals stockpile.

Materials Weekly

Week of September 20, 2026: Record Diesel, $14,000 Copper, and November's Rare-Earth Clock

Metals, critical minerals & ag inputs. Week of September 13–20, 2026.

Two things dominated the podcasts this week, and they pull in opposite directions. On the shiny side, copper keeps printing records and the people who mine it can barely believe the price. On the painful side, diesel just hit an all-time high right as American and Canadian farmers start bringing in the harvest, and the people who model oil for a living are openly admitting they no longer know how this ends. Underneath both stories runs the same current: a world nervously counting down to November, when the truce that keeps China's rare-earth magnets flowing to the West is set to expire.

Let's get into it.

TL;DR

  • Copper is around $14,000 a tonne, a record, and even the bulls are getting nervous. A Benchmark Mineral Intelligence analyst says the market has stopped trading on old-fashioned supply and demand and now runs on a story: artificial intelligence, the energy transition, and a fear there simply won't be enough copper in a decade (Sprott Radio).
  • Diesel hit an all-time high of $6.40 a gallon, up about 70% in a year, and it landed at the worst possible moment: harvest. JP Morgan's oil team told clients they "simply don't know how to model the endgame." A trucking bellwether, JB Hunt, had its worst day since 1983 (Morning Brew Daily).
  • The rare-earth clock is ticking toward November. A deep history episode laid out exactly why: the deal that restored the flow of Chinese rare-earth magnets to the world is a one-year truce that "is nearly up in November." China still does about 85% of the world's rare-earth processing (Sinica Podcast).
  • Washington is building an actual vault for critical minerals. A $12 billion government-backed program called VaultCo will buy 60 critical minerals on the open market and physically stockpile them as a buffer for US industry (Emerging Tech Horizons).
  • Lithium's "record" inventories may be a mirage. "Mr. Lithium" Joe Lowry argues much of the reported stockpile is the wrong brand for the buyers who need it; one big Chinese producer says its usable inventory was "basically negative" in September (The Global Lithium Podcast).
  • Tariff reminder: the US import tax on steel, aluminum and copper has doubled from 25% to 50%, and lawyers think it's here to stay (PwC).

What's New

Copper: a record price, and a market that runs on a story

Start with the number everyone kept repeating: copper is trading around $14,000 a tonne, an all-time high. To see how fast that happened, listen to Albert McKenzie, a copper analyst at the research firm Benchmark Mineral Intelligence, on Sprott Radio. Last year, he said, was "the first year ever that the LME averaged $10,000 a tonne" (the LME is the London Metal Exchange, the main global marketplace for the metal), and the all-time high back then was $11,000. Today it's $14,000, "up close to 50% in real terms."

His most interesting point is why. Copper used to be nicknamed "Dr. Copper" because its price was thought to diagnose the health of the whole economy: it goes into everything from houses to fridges to cars, so rising copper meant a growing economy. McKenzie says that link has broken: "It's moved away from some of the fundamentals we would traditionally look at and just seems to be consistently positive no matter whatever's happening." What's driving it now is a big overpowering narrative: artificial intelligence, the shift to electric power, and a widely shared belief that "there won't be enough copper in 10 years' time or 15 years' time." Tellingly, the price is now so high that it's "turned even some quite bullish people quite bearish," himself included.

Where is all the metal going? On DHUnplugged, the hosts put numbers on the AI angle: a single AI data center needs "about 30 to 40,000 tons of copper," against total global mine production of only about 23 million tons a year. But they're skeptical this is broad-based economic strength. They think a lot of the buying is "hoarding," companies stockpiling ahead of feared shortages and tariffs, which means copper may no longer be the reliable economic thermometer it once was.

On the supply side, the message from the mining executives was blunt. Vincent Metcalf of Pecoy Copper, on Mining Stock Daily, said the thing to watch isn't today's price but the fact that "global mine supply [is] declining, pretty much month over month," and that Chile, the world's biggest producer, reported July output "like 10% down" year over year. (One caution: he's a copper CEO talking his own book, so treat the bullishness accordingly.)

Diesel: the number that actually hits the real economy

If copper is the feel-good story, diesel is the gut-punch. The clearest summary came from Morning Brew Daily: diesel hit an all-time high of $6.40 a gallon, up more than 70% from a year ago. The trigger was an attack on a major Saudi pipeline near the Strait of Hormuz (the narrow sea passage that a huge share of the world's oil flows through), which, in the words of Chevron's CEO Mike Wirth, meant the "strategic buffers that had cushioned prices for months... have largely now played out."

Two details show how seriously the market is taking this. First, JP Morgan's commodities team, the people, as the hosts put it, "most plugged into oil," wrote that "for the first time since the start of the Iran conflict, we don't have a baseline view. We simply don't know how to model the endgame." When the top oil desk on Wall Street throws up its hands, pay attention. Second, the trucking company JB Hunt fell more than 13% in a single day, "one of its worst days since going public in 1983," after warning its earnings could drop 5% to 10%.

Why does a materials newsletter care about diesel? Because diesel is a farm input: it runs the tractors, combines and grain trucks, and this is happening right at harvest. On Closing Market Report, the national average was pegged at $6.27 a gallon, up 80 cents in a single month, and Senate Majority Leader John Thune said he's "open to considering a ban on U.S. diesel exports" to relieve the pressure. The supply picture behind it, explained on Oil Markets, is ugly: US distillate inventories are "the lowest since the 1980s," and Gulf Coast refiners keep exporting because selling abroad is so profitable, which leaves less at home. There's a knock-on for farm economics too: on the same Closing Market Report, an Illinois farmland researcher noted cash rents (what farmers pay to rent land) are expected to fall $3–5 an acre next year despite higher crop prices, because higher costs like diesel eat up the gains.

Rare earths: the clock is set to November

The single best explainer of the week was the Sinica Podcast, with two China scholars, Gloria Xiong and Jessica Chen Weiss.

Here's the plain-English version. Rare earths are 17 metallic elements used to make the super-strong permanent magnets inside electric-car motors, wind turbines, F-35 fighter jets and precision-guided missiles. They aren't actually rare in the ground; what's rare is finding them concentrated enough to mine and then separating them, which the host described as "chemically very fiddly and environmentally really filthy." China does roughly 85% of the world's processing.

The timeline matters. After the US "Liberation Day" tariffs in April 2025, China put seven rare earths and their magnets under export licensing; magnet exports "cratered," and within two months Washington was walking back its own restrictions to get the flow going again. Then in October came a bigger threat: China claimed the right to license any product anywhere in the world that contains even a trace of Chinese rare earths. A truce struck at Busan, South Korea, paused that for one year, "a year that, if you are counting, is nearly up in November." That is the catalyst hanging over this entire complex. The scholars' bigger argument is worth holding onto: China's dominance was not some decades-long master plan, but an "action-reaction spiral that neither side actually started," which means it could keep escalating.

Two responses surfaced the same week. Washington is building a literal stockpile: on Emerging Tech Horizons, VaultCo chairman Brett Lambert described a $12 billion program (ten billion in loans from the Ex-Im Bank, two billion in private capital) that will buy 60 critical minerals on the open market and hold them in a vault as a buffer for US industry. Companies can draw them down each year but must replenish within a year. And on tungsten (a critical metal for cutting tools and armor-piercing munitions), Mining Stock Daily reported a $150–175 million investment to restart Nevada's Springer tungsten mine, backed by a $150 million US Department of War commitment, with production targeted for late 2027.

Battery metals: are lithium's stockpiles real?

The most thought-provoking battery episode was Joe Lowry, "Mr. Lithium," on The Global Lithium Podcast. A data provider called SMM recently changed how it counts lithium inventory, and the new, higher stockpile figures spooked traders and knocked prices. Lowry's point: those warehouse numbers are misleading, because lithium is not interchangeable. Each battery maker needs specific brands, so a warehouse can look full while the usable supply is tight. He quoted a Ganfeng Lithium executive saying the company's inventory "was basically negative in September" even as reported warehouse receipts kept rising. The takeaway: don't trust headline lithium inventory numbers at face value.

On graphite, the material that's actually the biggest ingredient by weight in a lithium-ion battery, South Star's CEO Thiago Cunha, on Company Interviews, flagged the core Western problem: China controls "approximately 80%" of graphite (nearly 90% if you count its projects in Africa), and unlike rare earths, graphite has no government floor-price support. So any non-Chinese producer has to survive being "the last man standing" against deliberately low Chinese pricing.

The Debate

Is copper's record price a supercycle or a bubble? This was the real argument running under the week. The bullish case is structural and came from the miners: supply is falling month over month, the best ore bodies are getting scarcer, and AI plus electrification create demand that didn't exist a few years ago. The cautious case came, interestingly, from the analyst closest to the metal, Benchmark's Albert McKenzie, who warned the market has detached from fundamentals and is running on narrative and stockpiling, to the point where he's "more bearish because... the price is just really high." The DHUnplugged hosts sharpened it: if a lot of the buying is hoarding rather than real consumption, the record price is telling you less about the economy than it seems. Both sides can be right for a while; a genuine long-term shortage and a short-term price that has run ahead of itself are not mutually exclusive.

Diesel: temporary shock or the new normal? The honest answer from the podcasts is that nobody knows, and that's the point. JP Morgan literally told clients it can no longer model the outcome, and noted that the economic "red lines" it once assumed the US wouldn't cross ($100 oil, $5 gasoline) have already been crossed. The optimistic read is that this is a war-driven spike that fades if the Middle East calms. The pessimistic read, in JP Morgan's words, is that "the assumption that the disruption is temporary is becoming increasingly difficult to sustain."

The Names in Play

A quick tour of the specific companies that came up, and why. (These are things executives and hosts said on podcasts, not recommendations, and company CEOs are naturally talking up their own projects.)

Copper

  • Southern Copper (SCCO) and Freeport-McMoRan (FCX): the two large-cap copper names an advisor on InvestTalk said he holds for clients. He called Southern Copper the world's largest holder of copper reserves with the longest mine life; the stock is up about 36% this year and 79% over 52 weeks, with revenue rising from $9.8 billion (2023) to $16.9 billion. His honest caveat: those record profits are mostly the high copper price landing on flat production, and "miners are leverage bets on the underlying commodity."
  • Ross Beaty: the legendary resource investor told his own copper story on Money of Mine. Spotting a roughly 50-year copper cycle, he bought "every single copper deposit [he] could find" in the early 2000s, put in about $200 million, and sold them for "a little bit over $2 billion," an 80-times return for early backers. His last venture is Lumina Metals, a Polish copper-silver project.
  • Power Metallic (Terry Lynch): on The KE Report, the CEO said copper is about 58% of the value in its LION/NISK deposits, and that the company's resource was modeled at "$4.80 copper" versus "close to seven bucks" today, implying, in his telling, 2.5–3x upside before any resource growth.
  • The explorer crowd: Element 29 (Peru), Gladiator Metals (Yukon, partly funded by BlackRock), Red Metal Resources (Chile), Surge Copper and Gunnison (a Rio Tinto venture) all featured on drill-result and permitting news.

Battery metals

  • Standard Lithium (David Park): on Rock Stock Channel, the CEO pitched a new East Texas project (Franklin) at up to 70,000 tonnes a year, ~$5 billion after-tax value and a >24% return, part of a vision to make the Smackover Basin "lithium's Permian." A final go/no-go decision is targeted for year-end.
  • Sigma Lithium (Ana Cabral): on Rock Stock Channel, the CEO said the company runs a 47% profit margin even at these lithium prices, with costs so low ($452 all-in) that today's ~$2,100 price is "3-4 times" its cost, and dismissed a Brazilian court ruling against its license as "not currently enforceable."
  • South Star Battery Metals: the new Western Hemisphere graphite producer described above.

Rare earths, tungsten & phosphate

  • VaultCo: the $12 billion US critical-minerals stockpile.
  • Blue Moon Metals, The Elmet Group, EQ Resources: the trio restarting the Springer tungsten mine in Nevada with Pentagon backing.
  • First Phosphate (PHOS): on Mining Stock Education, the CEO said his Quebec phosphate mine has locked in over $400 million of its ~$475–500 million cost from government lenders (Danish, Ex-Im, and a new Swiss facility), meaning far less need to issue dilutive shares, a rare bright spot in fertilizer-adjacent mining.

Fertilizer's wild card

  • Switch Bioworks (Tim Schnabel): on Climate CEOs, the CEO described engineering microbes that live on corn roots and produce nitrogen directly, aiming to cut the roughly $100-an-acre farmers spend on nitrogen fertilizer toward $1 an acre. It's early (they've raised $24 million and need years of field data), but if it works it's a long-term threat to the traditional nitrogen fertilizer business, whose century-old chemical process consumes energy equal to about 200 nuclear power plants worldwide.

Read-Throughs

  • Copper's record is partly an AI story now, which cuts both ways. If a data center swallows 30–40,000 tons of copper, the demand is real, but it also means copper is increasingly hostage to the AI capital-spending cycle. If that spending wobbles, one of copper's new pillars wobbles with it.
  • The diesel spike is a hidden tax on the entire food chain. It doesn't show up as "higher fertilizer prices," but it raises the cost of planting, harvesting and hauling every crop, and, as one analyst noted, it's absorbed first by farmers and truckers before it reaches the grocery store weeks later. Watch trucking and rail (JB Hunt's warning) as the early warning system.
  • November is the date to circle for critical minerals. The one-year rare-earth truce lapsing is the biggest scheduled catalyst on the board. Every US response this week (the VaultCo stockpile, the Pentagon-backed tungsten restart, the government-funded phosphate mine) is really the same trade: the West paying up to build supply chains that don't run through China.
  • Be skeptical of "record inventory" headlines in lithium. Joe Lowry's point generalizes: in opaque, non-standardized markets, a warehouse that looks full can still be functionally empty for the buyers who matter.

What Changed This Week

  • Copper printed a fresh record (~$14,000/tonne), and the sell-side analyst closest to it turned cautious even as the miners stayed bullish.
  • Diesel hit an all-time high ($6.40/gal), JP Morgan admitted it can't model the outcome, and a diesel export ban went from unthinkable to something the Senate Majority Leader is "open to considering."
  • The rare-earth countdown got a hard date in the public conversation: the truce is "nearly up in November."
  • The US stockpile went concrete: VaultCo, a $12 billion buying-and-warehousing program, is now up and running rather than a proposal.
  • Section 232 tariffs on steel, aluminum and copper are confirmed at 50% (doubled from 25%) and, per tax specialists, likely permanent.