# Industrial Materials - Week of May 31, 2026: Copper's $6 Floor and the Sulfur Backdoor into Fertilizers

> Metals and materials weekly for May 26–29, 2026. A wall-to-wall copper tape converges on a $6+ structural-deficit thesis, while the under-priced read-through, China's sulfuric acid export ban, points straight at phosphate fertilizers.


## Industrial Materials

### Week of May 26–29, 2026

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Hi,

Sometimes the most important trade of the week shows up sideways. This week's podcast tape was wall-to-wall copper, but the line worth circling came inside a copper episode and points straight at phosphate fertilizers. If you only have ten minutes today, read this for the sulfur story; the rest is supporting evidence.

## TL;DR

- **Copper is now a $6+ commodity with operators calling it a floor, not a peak.** Spot $6.30–$6.50/lb, COMEX-LME arb ~$500/mt, Grasberg offline until 2028, and a U.S. primary-copper tariff decision on the calendar.
- **The under-priced story is sulfuric acid.** China banned sulfuric acid exports on May 1; ~50% of global sulfur transits Hormuz; sulfur prices +~80%. This hits ~17% of global copper supply (SX-EW, mostly DRC), and it is the dominant input cost for phosphate fertilizers. MOS and NTR phosphate exposure is the read-through nobody's talking about.
- **Rare earths, lithium, and U.S. steel were quiet on the pods this week.** Aluminum got one mention (4-year high, China capacity throttle). I'd rather flag that than fabricate the missing legs.

---

## What's New

**1. The single most important episode of the week: Scott-Gray on the Hormuz/sulfur shock.** On The Derivative ("'Dr. Copper': From Chilean Mines to Chinese Smelters to AI Data Centers," May 28), StoneX senior metals demand analyst Natalie Scott-Gray laid out the cleanest framing I've heard on copper this year. Two numbers to take away: she calls the U.S. refined-copper tariff deadline (July 30, with a proposed step-up to 15% by early 2027 and 30% by 2028) *"arguably the most significant thing in the copper market that will happen this year"*; and she flags China's May 1 ban on sulfuric acid exports as the supply shock the market hasn't priced. SX-EW is ~17% of global copper, ~60% of which sits in the DRC, with *"2 to 3 months"* of sulfur stocks. Co-host Kurt Nelson (SummerHaven, CPER ETF) added: *"I haven't seen that flow through price yet."*

**2. Tariff arbitrage already happened, $1.6 million tonnes of it.** Same episode: roughly **1.6 Mt of refined copper has already shipped to the U.S. on the CME-LME arb in the last year**, with the spread peaking at *"$3,000 premium, if not more."* Q1 2026 global visible stocks (COMEX+LME+SHFE) hit a record, with the bulk in the U.S. Translation: a lot of the front-end of the tariff trade is in the price. The back-end, what happens to ex-U.S. inventories when the bonded copper stops flowing, is not.

**3. Operator base case: $6 is a base, not a peak.** On The KE Report ("Investors Rotating Money In Metals," May 28), Junior Stock Review's Brian Leni reported, from a direct conversation with an Australian concentrate trader, that smelter TC/RCs are persistently negative: *"there's just no supply for these smelting operations. The negative treatment charges is here to stay."* On Wall Street Unplugged (May 27), Coppernico CEO Ivan Bebek confirmed Grasberg *"won't be able to go back into production until 2028"* after the pit-wall collapse. He thinks *"the price of copper is going to double in the next few years."* When operators with skin in the game say "double from here," I don't dismiss it, but I do underwrite it.

**4. The economics of new copper supply are still ugly, and that's the bull case.** On Mining Stock Daily ("Live from the Deutsche Goldmesse," May 26), Marimaca CEO Hayden Locke benchmarked his $587M capex against peers: *"the average capital cost two years ago was over $3 billion."* Locke's AISC of ~$2.30/lb against a $6+ spot is the kind of margin that gets DFS projects financed; the problem is *"the cupboards are very bare"* of sub-billion-dollar capex projects. Greenfield lead time is now widely cited at **12–17 years**.

**5. Sell-side base-metals desk: floors have been reset.** On The KE Report (Darrell Fletcher, May 27), Bannockburn's commodities MD pointed to LMEX +13% YTD, copper Dec-2028 contango at ~$7.00/lb, and aluminum at a 4-year high on China's capacity throttle (Midwest premium ~$1.15–$1.16/lb; LME aluminum >$3,600/mt). His read: *"base-metal floors have really been reset."*

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## The Debate

> "By 2028, we hit a massive deficit in all sorts of critical minerals.", Tracy Shuchart, Mining Stock Daily, May 29

**The bull case got the airtime this week.** Six years of underinvestment, declining ore grades, AI/data-center demand layered on EV and grid, Grasberg out until 2028, Kamoa-Kakula flooding (output cut ~28% per Scott-Gray), and Chile earthquake disruption. Plus the resource-nationalism stack: Zimbabwe lithium ban, DRC cobalt restrictions, China's sulfuric acid ban. The structural-deficit thesis pegged to ~2030 was repeated, in some form, on every single episode this week.

**The bear case, in fairness, was barely voiced on the pods this week.** The honest pushback would be: record visible inventories in Q1, a meaningful chunk of the U.S. tariff trade already in the price, a hawkish Lisa Cook reminding everyone that the Fed cross-current is real (Mining Stock Daily morning briefing, May 28), and the awkward fact that nobody on the pod circuit this week made the demand-air-pocket argument with conviction. When the tape is this one-sided, that itself is a signal, usually that positioning is getting crowded.

## The Names Actually Moved

- **FCX**: Grasberg restart pushed to 2028 by multiple operator/CEO speakers. That's a real production hole.
- **TECK**: Confirmed ~10% holder of Coppernico (per Bebek); Anglo merger forming the ~$80B base-metals co. Strategic signaling matters here.
- **MOS / NTR**: Not mentioned by name on any episode this week, but the sulfuric acid input is the most under-discussed read-through in the tape. Do the work on phosphate cost curves before next week.
- **MARI (Marimaca)**: Fully permitted, DFS done, AISC ~$2.30/lb, FID mid-2027, a rare developer at sub-billion capex.

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## Read-Throughs

- **Copper royalties/streamers** (FNV, WPM, RGLD, TFPM, OR): structural beneficiaries of any sustained re-rate, with no operational acid exposure. Nick Hodge (KE Report, May 29) noted the PICK ETF +~47% since October on a similar setup.
- **Phosphate (MOS, NTR phosphate, OCP)**: cost-curve read-through from sulfur +80% and the China acid ban is direct and underappreciated. Phosphate processing is acid-intensive.
- **Aluminum (AA, CENX)**: 4-year highs on China capacity discipline (45.5 Mt domestic ceiling) per Scott-Gray on The Derivative. Midwest premium structurally elevated.
- **Magnets / rare earths (MP, LYC, NEO)**: silent on the pods this week. With the April 2025 controls still in force and the one-year suspension running to November 2026, no operator voiced an updated view, which doesn't mean nothing is happening, it means we wait.

## What Changed

The Hormuz/sulfur thread is the only genuinely new cross-asset story to surface this week. The structural copper deficit thesis is not new; what *is* new is that operators and analysts independently converged on it on the same week, at $6+ spot, with Grasberg's 2028 timeline now confirmed by a CEO with a strategic stake. The fertilizer angle is the second-derivative trade most people will miss because it broke inside a copper podcast.

Your weekly note

## Sources

- [The Derivative, "'Dr. Copper': From Chilean Mines to Chinese Smelters to AI Data Centers in the US", Kurt Nelson & Natalie Scott-Gray, May 28, 2026](http://url7324.matterfact.com/ls/click?upn=u001.idHmPrr2Geh7KYLAsTy7NkrIVb-2FgA4pmf2rMXQwGcOgk7-2BkHSssMK8YxSci2V4pckKR-2BFD64sp1jC-2Fa851Ux8mpdGaBK8pZLjs7cUU606P6r-2B45SihtauOQSAn4Jn6fm7BTk5usRL0p9fSi-2FiXzbhQ-3D-3DAZkr_7mLGwmUci-2BLaXswv9WX1yTgqn3Wad-2FotHhzHgSNAZbXeFNObGJrKKNUiHA-2FJ3OCnx9uJwEGW8YPYgPL46nahGD6GIUMPDDHcFhCrn7M0iVmVw-2B3IR7j21-2BV01gDsc5vHacIoF96uafjkcfdCgp00mmquXTtvhNZhaE9sFCwcacWxVi7C1KMtop7kZBxrssY2Exc7PhIsRH-2F6gTjcLtmrOQ-3D-3D)
- [The KE Report, "Darrell Fletcher - Navigating Global Commodity Trends & Structural Shifts: Oil, Nat Gas, Copper, Critical Minerals, Gold," May 27, 2026](http://url7324.matterfact.com/ls/click?upn=u001.idHmPrr2Geh7KYLAsTy7NkrIVb-2FgA4pmf2rMXQwGcOjdr3kjf1wC5aeHbajJMDr5kQA6hlRGqqxgW4mv33YnXRRJ6DoUcLw-2FhufwzCOMBqQNQjoPEwqwB5XYqhL85y4cRps7lOjnbpmK4UNZisLJZw-3D-3DtSi__7mLGwmUci-2BLaXswv9WX1yTgqn3Wad-2FotHhzHgSNAZbXeFNObGJrKKNUiHA-2FJ3OCnx9uJwEGW8YPYgPL46nahGFZtnsTxeXBLa4NnxvUYEUaQZkeCQGzvcU-2F52g6I4hRCJhNwrTo6Vekf3K36Jfb4surEFlO-2BG3c5mybF9COcRfAsBXDuf2Fj6HyHTzyI97xVljHe48j-2BzRZNbnzYUYrNsQ-3D-3D)
- [Mining Stock Daily, "Tracy Shuchart: Markets Still Don't Understand the Commodity Crunch," May 29, 2026](http://url7324.matterfact.com/ls/click?upn=u001.idHmPrr2Geh7KYLAsTy7NkrIVb-2FgA4pmf2rMXQwGcOiwNBLo9GdOEcOfFRQvpH98oa872Zwn0tAPRtfMIi4YuDUDEwQeywWqmbKsvsKDm65c9CLjzJA7abuVvvt2P7ppsfYOHyAZJKhzvi4F-2Fp5XYQ-3D-3DYW-p_7mLGwmUci-2BLaXswv9WX1yTgqn3Wad-2FotHhzHgSNAZbXeFNObGJrKKNUiHA-2FJ3OCnx9uJwEGW8YPYgPL46nahGMKWj3KDSk8gP3WUgrfCNkkCBVA1k6L85oC9HI-2B-2Bdj-2FP8aNGqwpF7rpENjlDye0hLsEW3QJWDbgUSUOIRNKnUjX5QQL-2F7OQdCw4rnqqtiKMrels5Jn4UvKh0VGneXHsTJA-3D-3D)
- [The KE Report, "Brian Leni - Investors Rotating Money In Metals: Copper & Copper Stock Outlooks," May 28, 2026](http://url7324.matterfact.com/ls/click?upn=u001.idHmPrr2Geh7KYLAsTy7NkrIVb-2FgA4pmf2rMXQwGcOiVJ5wvvSQoy8ojoQS4ETcXnCg0f6mjEwOQkDAJRw7ckvbazJtcAIvzeVAXc5NvA5x9rdqOM4XcWVh017OIq5cBdWi-2Fe0mz7UqDg7VJq12pwA-3D-3D5yWD_7mLGwmUci-2BLaXswv9WX1yTgqn3Wad-2FotHhzHgSNAZbXeFNObGJrKKNUiHA-2FJ3OCnx9uJwEGW8YPYgPL46nahGFxMnRzGTLqQ57NKUQQzyuQIdyoBjJ-2F1dkqKbhOZ6Qyt8ZZvUv1DIhnYqs7VGPBESGt3-2BHl0g9nQNY6FKWrkWZwvyjFQn0lfvcahbd2jnRbYCvd6KntwB-2FQ5jEfIQCjdfg-3D-3D)
- [The KE Report, "Nick Hodge – Macro Market Movers, 2 Site Visits, and Investing Strategies in Copper, Gold, And Critical Minerals Stocks," May 29, 2026](http://url7324.matterfact.com/ls/click?upn=u001.idHmPrr2Geh7KYLAsTy7NkrIVb-2FgA4pmf2rMXQwGcOg0LDo2DSV2TMCxR67iconys4jfBS9Pc0CPx3HaDFX7zoY5aW9RNrcqodSkLXxyYamWZj1ffhK-2FAGmXCROA71BEcUDaSvY1-2FiTfdeGCQncWZw-3D-3DdtpC_7mLGwmUci-2BLaXswv9WX1yTgqn3Wad-2FotHhzHgSNAZbXeFNObGJrKKNUiHA-2FJ3OCnx9uJwEGW8YPYgPL46nahGFjCo1STUQep5hyww0VS49CSu06E1q2u6cFmQ3ax099QfF4kE59ksglMIlbLzl7zERV0FteT3206QxEZktmdPU3R7vxbx-2BIxuFt-2BuPtY6FeEMAOk0XoeaK8i4ArgnnB5tg-3D-3D)
- [Wall Street Unplugged, "Ivan Bebek's new project could become the world's largest copper mine," May 27, 2026](http://url7324.matterfact.com/ls/click?upn=u001.idHmPrr2Geh7KYLAsTy7NkrIVb-2FgA4pmf2rMXQwGcOj-2FllgGJNkW0UZR64rpNBf5C5fdZVEXjLiXoS0nPtdc6eJTBLzjhXyFiCZx9oKS5Glj64CKpFLgHzLieD-2B9AAJIj0EhAsFrUQgi65dwKTOxtQ-3D-3DGLMx_7mLGwmUci-2BLaXswv9WX1yTgqn3Wad-2FotHhzHgSNAZbXeFNObGJrKKNUiHA-2FJ3OCnx9uJwEGW8YPYgPL46nahGEdnmVkMhnZ-2FRZItSu-2FxZg1pd9WAe-2FRgIEbaWt0DgFTs4iivOhLc6Te-2Fp-2FzJG8tozOE0F5q2lJ-2FySQDTlo5Zo27RnbHIBW-2FTVQDbKQcnMJZSRHPzReFjrfMyXSiv20VFnQ-3D-3D)
- [Mining Stock Daily, "Live from the Deutsche Goldmesse: Marimaca Copper Targets 2027 Construction Decision as Pampa Medina Emerges as Major Chilean Copper Discovery," May 26, 2026](http://url7324.matterfact.com/ls/click?upn=u001.idHmPrr2Geh7KYLAsTy7NkrIVb-2FgA4pmf2rMXQwGcOh65rrVRXTY36lCkByjL0hEkrP64FFsLVlpVsw2uvEtq-2F8CE9j6L5EXoSF-2FUbxAEeyfpH2nivoIdM1dCiwKQWZi9uvBeNj3fd7vuGr1UTrPJQ-3D-3DbzZR_7mLGwmUci-2BLaXswv9WX1yTgqn3Wad-2FotHhzHgSNAZbXeFNObGJrKKNUiHA-2FJ3OCnx9uJwEGW8YPYgPL46nahGKOH4GSYGJeZvEkIByvbJSofTFwmMZwJoKSQJyIw1Chp6M0xLmV-2Bn0jSN5j4b2XtrhtUycxRqK-2BwdO-2FBN1vMxnUELX86d3GIL8rbLZiNEntg8N-2FhZuhBCOqg8Hm9zLyliA-3D-3D)
- [Mining Stock Daily, "Live from Frankfurt at the Deutsche Goldmesse: Pan Global Advances Spain Copper-Gold Portfolio with New Funding and Expanded Drill Plans," May 26, 2026](http://url7324.matterfact.com/ls/click?upn=u001.idHmPrr2Geh7KYLAsTy7NkrIVb-2FgA4pmf2rMXQwGcOgcX29i-2FZPl8BWzKo96Y4fwjsjyqy9a0VOXr1HSjF4luNGNVYTyAtRZKgA1mcHxfWRyJdRMT5R8lPwwbLZK8gTAw7TmYSudLS4XJC0FT5CjEw-3D-3DK7--_7mLGwmUci-2BLaXswv9WX1yTgqn3Wad-2FotHhzHgSNAZbXeFNObGJrKKNUiHA-2FJ3OCnx9uJwEGW8YPYgPL46nahGNYDBU4Rq7VhMe6fQ3dHDVfWGh4JZAIiXzh5LxndAxFCAthtLSBdLqEttGFw3fX5JQuP8XCRnxIudLhg9ANnIUFJ5bWzX3pwR2akKWe1WhFNPCi8TBcXL-2B342jq9vuoX9g-3D-3D)
- [ITM Trading Podcast, "CEO Reveals $45M Copper-Gold Monster: 15,000m Drill Program Starting NOW!" May 27, 2026](http://url7324.matterfact.com/ls/click?upn=u001.idHmPrr2Geh7KYLAsTy7NkrIVb-2FgA4pmf2rMXQwGcOi504PG-2BpwYehY8BNnVy23S-2Fzp9Ltr3m-2BieeQuAYD2Ujm5JBveeOIaIuHlL9jfi5OucjzFfDfgfTJQdnG0Bh2eZiFtw2oIjvK9M6Gq59QIl2g-3D-3DMOP0_7mLGwmUci-2BLaXswv9WX1yTgqn3Wad-2FotHhzHgSNAZbXeFNObGJrKKNUiHA-2FJ3OCnx9uJwEGW8YPYgPL46nahGKGny7NoyOZxfbyCN9oI28x8OtPqi3iADkUN-2FKUd6U01s-2F1wOv-2BEBTlLijiRaP46KmK7jmLXewGqW2xRbudzdanS5OzkpdvGoWn1PtYrs2vuldjtIkwFo0SCMspjRcKa2w-3D-3D)
- [Mining Stock Daily, "Morning Briefing: A Combination of Factors Driving Metals Lower this Morning," May 28, 2026](http://url7324.matterfact.com/ls/click?upn=u001.idHmPrr2Geh7KYLAsTy7NkrIVb-2FgA4pmf2rMXQwGcOgAJ4kxez8GkgeZluc82AzoEqkKxXa8KcDtmJiwCRaTtfZA87fiDG1Jjm7AyToK-2Be-2FYcc6dRQA8lgsrTpI6HzOs5PB4sMnWujjmKUMQXEF3Cg-3D-3DauI7_7mLGwmUci-2BLaXswv9WX1yTgqn3Wad-2FotHhzHgSNAZbXeFNObGJrKKNUiHA-2FJ3OCnx9uJwEGW8YPYgPL46nahGDAsr4rM0dXYFPeSLJwEEPW-2BUOuMpmuZSfrJfMGhetGtFXCnCiq47jeMZ7ZtOPcPTpJE45QZ3Pt4uHTBMm1Zkrdr8bMm-2Fk5eAwpbdy6zUV3hvdICl2V7a0LmO3IIe1CWuw-3D-3D)

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