The annual zinc treatment charge (TC) benchmark negotiations for 2026 have concluded at $85 per dry metric tonne (dmt), a marginal increase from the 2025 settlement of $80/dmt that was widely seen as the cyclical floor. The outcome reflects a market in which global concentrate supply is expanding faster than smelter capacity can absorb it, yet the increase is too small to provide meaningful margin relief for zinc smelters facing rising energy and operating costs. (FACT: Fastmarkets, May 2026)
The benchmark crystallises a structural shift. Global zinc mine output is projected to grow by approximately 300,000 tonnes in 2026, driven by the ramp-up of new mines in Africa, Australia, and South America. This additional concentrate tonnage enters a smelter market where capacity additions have been modest and constrained by environmental permitting, energy price inflation, and, in some regions, outright power shortages. The result is a concentrate market that is increasingly well-supplied — favourable for smelters in principle — but the TC level negotiated barely reflects that abundance. (FACT: Fastmarkets Monthly Base Metals Market Update, 2026)
The discrepancy between benchmark TCs and actual spot-market economics is most pronounced in China. Domestic treatment charges inside China have been collapsing at a far steeper rate than the global benchmark suggests. Chinese smelters, which process a significant share of the world's zinc concentrates, are facing domestic TCs that have fallen well below international levels as the country's own mine supply struggles to keep pace with its enormous smelter capacity. The gap between Chinese spot TCs and the global benchmark has widened, forcing Chinese smelters to either accept lower margins on domestic concentrate or compete for seaborne material at international terms. (FACT: Metal.com, 2026)
The compression of TC margins has direct consequences for zinc metal output. When smelter margins are squeezed below breakeven, the rational response is either to curtail production or to push for higher treatment charges on the next negotiation cycle. In 2026, some Chinese smelters have already signalled operational adjustments, citing negative realised TC margins after factoring in energy costs, labour, and by-product credits. The TC squeeze therefore acts as a self-limiting mechanism on zinc metal supply: at some price level, smelters will cut runs, tightening the refined metal market and potentially supporting LME prices despite the concentrate surplus. (FACT: Metal.com, 2026)
The concentrate surplus is itself a nuanced story. While global mine output is rising, the distribution of that surplus matters enormously for TC dynamics. Concentrate from new African and Latin American mines tends to flow to Asian smelters, including China and South Korea, where the marginal smelter determines the global TC floor. European smelters, by contrast, face higher energy costs and tighter environmental regulation, making them less competitive bidders for concentrate. The TC benchmark of $85/dmt therefore reflects the economics of the marginal Asian smelter rather than the global average. (FACT: Investing News, Zinc Forecast, 2026)
For the second half of 2026, the direction of TCs will depend on three variables. First, whether the projected +300kt in mine supply actually materialises — mine ramp-ups are notoriously unreliable. Second, whether smelter margins deteriorate enough to trigger meaningful closures. Third, whether the global refined zinc surplus (forecast for 2026-2027) begins to erode as demand growth, albeit low single-digit at around 1%, absorbs excess metal. If smelter cuts precede mine cutbacks, the concentrate surplus could persist even as refined metal tightens — an unusual configuration that would keep TCs depressed while supporting LME prices. (FACT: Fastmarkets, May 2026; Investing News, Zinc Forecast, 2026)
The TC squeeze creates a two-sided risk for zinc buyers. On the one hand, depressed treatment charges reduce the incentive for smelters to maximise output, which could tighten refined metal availability in H2 2026 and push prices higher. On the other hand, the concentrate surplus means any price rally will eventually incentivise smelter restarts and increased output, capping the upside. Buyers should watch Chinese smelter operating rates as a leading indicator — if utilisation falls below 75%, expect tighter physical availability. The TC dynamics also favour long-term contracting over spot purchases, as annual TC negotiations provide more predictable margin economics for suppliers.