Extraction / Resources & Sovereignty
On May 28, 2026, Reuters reported that the US copper market was pricing in the probability that the Commerce Department’s June 30 report to the President will recommend extending Section 232 tariffs to refined copper, the one category of copper product that has so far been exempt. The signal is not a policy announcement. It is a market assessment of where the tariff regime is heading. The distinction matters because the entire African copper export chain, from Kamoa-Kakula’s anodes to Zambia’s cathodes to the DRC’s concentrates, is structured around the current exemption. If refined copper (cathodes, anodes) enters the Section 232 framework, the terms of trade for African producers shipping to the United States change overnight.
The tariff architecture is already in place for everything except raw and refined inputs. On August 1, 2025, President Trump imposed 50% Section 232 tariffs on semi-finished copper products (pipes, wires, rods, sheets, tubes) and copper-intensive derivative products (cables, connectors, electrical components). The United States imported $15.5 billion worth of such products in 2024. On April 2, 2026, a presidential proclamation modified the regime: the 50% tariff now applies to the full customs value of articles made entirely or almost entirely of copper, 25% to derivative articles substantially made of copper, and 15% to certain metal-intensive industrial and electrical grid equipment through 2027. Products made abroad entirely from American copper face a reduced 10% rate. Products with 15% or less copper content are no longer subject to Section 232.
What remains exempt, for now, are copper input materials: ores, concentrates, mattes, cathodes and anodes. These are precisely the products that African producers export. The DRC ships concentrate and, since Q1 2026, copper anodes from Kamoa-Kakula’s new smelter. Zambia exports cathodes and concentrate. The exemption was deliberate: the Commerce Department’s July 2025 investigation found that the United States lacks sufficient domestic refining capacity to process its own concentrate, making tariffs on input materials counterproductive to the stated goal of rebuilding domestic copper supply chains. The exemption was accompanied by a directive: by June 30, 2026, Commerce must provide the President with an update on domestic copper markets, including refining capacity and the market for refined copper. Based on this report, the President will consider imposing phased tariffs on refined copper starting at 15% on January 1, 2027, rising to 30% on January 1, 2028.
The June 30 deadline is now 32 days away. The Reuters signal indicates that market participants expect the Commerce report to recommend extending tariffs to refined copper. The logic is consistent with the administration’s broader tariff strategy: every Section 232 investigation completed during the second Trump term has resulted in tariff expansion, not contraction. The steel and aluminium inclusions processes added hundreds of products to those tariff regimes after initial implementation. The copper regime has already expanded once (the April 2, 2026 proclamation). The structural direction is toward comprehensive coverage.
For African copper exporters, the implications depend on which products they ship and to which destination. The United States is not the primary destination for African copper. China absorbs the majority of DRC and Zambian output, with Europe and Asia taking most of the remainder. The Lobito Corridor, documented extensively in this series, is designed to route Central African copper to Atlantic markets, which include both European and American buyers. The first Kamoa-Kakula anode shipment via Lobito in Q1 2026 went to the Aurubis refinery in Europe, not to the United States. But the US is a growing destination as the Orion Critical Mineral Consortium and the DFC-backed supply chain strategy documented in the critical minerals article seek to redirect African minerals toward American end-users.
The paradox is sharp. The United States is simultaneously trying to attract African critical minerals into its supply chain (the DRC shortlist, the Lobito Corridor, the Pensana rare earth-to-eVAC pipeline) and imposing tariffs that could make African refined copper more expensive for American buyers. A 15% tariff on cathodes imported from Zambia would add approximately $2,100 per tonne at current prices ($14,000/tonne). A 30% tariff in 2028 would add $4,200. For an American manufacturer buying copper cathode to produce wire or cable (which already faces a 50% tariff on the finished product if imported), the economics of sourcing African refined copper rather than buying American cathode shift materially.
The DFC’s critical minerals strategy is designed to build a mine-to-market pipeline that brings African minerals into the American industrial base. If tariffs apply to the refined product at the end of that pipeline, the strategy’s economics are undermined. Kamoa-Kakula is investing $1 billion-plus in a smelter that produces 99.7% pure copper anodes. If those anodes face a 15 to 30% tariff upon entry to the US, the incentive is to ship them to China or Europe instead, exactly the outcome the US strategy is designed to prevent. The same logic applies to Zambian cathodes. The tariff creates a structural disadvantage for the supply chain that the DFC, the Lobito Corridor and the Orion Consortium are being built to serve.
The counterargument, made by proponents of the tariff, is that the United States needs to rebuild domestic refining capacity, and tariffs on refined imports create the price incentive for that investment. The Commerce report will presumably assess how much refining capacity has been added or committed since August 2025, and whether the domestic market can absorb the copper inputs that would flow from expanded smelting. The US currently imports approximately 40% of its refined copper. Domestic smelting and refining has been declining for decades. Rebuilding it takes years and billions in capital. The question is whether tariffs accelerate that rebuild fast enough to substitute for the African and Chilean refined copper that American manufacturers currently rely on.
For the copper deficit documented in this series (150,000 to 590,000 tonnes in 2026), US tariffs add a trade friction layer to an already tight market. If tariffs apply to refined copper, American buyers pay more, but the physical copper still needs to come from somewhere. The deficit is global, not American. Tariffs do not create new supply. They redirect existing supply toward markets that do not impose them. In a world where the DRC and Zambia produce roughly one-sixth of global copper and are the primary growth source for the next decade, tariffs that discourage their refined product from entering the US market push those tonnes toward China and Europe, reinforcing the supply chain dependency that the tariffs are nominally designed to break.
The April 2, 2026 modification introduced a category that is directly relevant to the Lobito Corridor thesis: products made abroad entirely from American copper face a reduced 10% tariff. This creates an incentive structure where an American company could, in theory, ship American copper concentrate to an African smelter, have it refined into cathode or anode, and reimport it at 10% rather than the standard 15 to 30%. Whether this provision is practically useful depends on whether the logistics of shipping concentrate across the Atlantic and back are competitive with the alternative of building domestic refining capacity. For the Lobito Corridor, which is designed to move African copper westward, the provision is misaligned: it incentivises moving American copper to Africa, not the reverse.
The structural question for the series is whether the US tariff regime on copper is a trade instrument or a strategic instrument. If it is a trade instrument, its purpose is to protect and rebuild domestic industry, and the tariff on refined imports is consistent with that goal regardless of the impact on African supply chains. If it is a strategic instrument, its purpose is to redirect global critical mineral flows toward the United States and away from China, and the tariff on refined African copper directly contradicts that goal. The DRC shortlist, the Lobito Corridor, the Orion Consortium and the Pensana-eVAC pipeline are all strategic instruments. The Section 232 copper tariff is a trade instrument. The two are not aligned. The June 30 Commerce report is the moment when that misalignment either gets resolved or gets worse.
For African governments and operators, the practical response is straightforward: diversify export destinations, prioritise markets that do not impose tariffs on refined copper (Europe, Asia), and use the US tariff uncertainty as leverage in negotiations with European and Chinese buyers who benefit from the American self-imposed disadvantage. If the US makes African refined copper 15 to 30% more expensive for its own manufacturers, the bargaining position of African producers in non-US markets improves. The copper is the same. The deficit is the same. The buyer who imposes the fewest barriers gets the marginal tonne. The tariff roulette is American. The leverage it creates is African.