The zinc concentrate market is in its tightest state since 2018, and the pressure is now shifting from miners to smelters. Spot treatment charges of $40-55 per dry metric ton are less than one-third of the $180-200/dmt that most smelters need to cover their fixed and variable processing costs. At current TCs, smelters are losing $100-150 on every ton of zinc produced.
European smelters are feeling the squeeze most acutely. Nyrstar's Budel smelter in the Netherlands (315,000 tpy capacity) is operating at roughly 60% utilization, according to trade sources. Glencore's Nordenham smelter in Germany (165,000 tpy), which restarted in Q1 2024 after a two-year curtailment during the energy crisis, is running at 75-80% but faces a decision on whether to secure Q3 concentrate at money-losing TCs or trim output.
Chinese smelters, which account for 47% of global refined zinc production, processed 2.8% less concentrate in May than in April, per Shanghai Metals Market (SMM) data. The decline is partly maintenance-related but also reflects voluntary cuts as smelters conserve concentrate inventory. SMM reports that Chinese smelter concentrate inventories have fallen to 18 days of cover, down from 26 days in January and below the 22-day comfortable minimum.
The global zinc mine production story explains why TCs are where they are. Q1 2026 mine output grew only 0.3% year-over-year, per ILZSG data. Key mines are aging: Glencore's Mount Isa in Australia (300,000 tpy zinc in concentrate) is nearing end of life, Peru's Antamina is processing lower zinc grades as the pit transitions to copper-dominant zones, and new projects like Nexa's Aripuana in Brazil (70,000 tpy) are ramping slower than expected.
The math confronting the market: global zinc mine capacity is effectively flat at roughly 13.2 million tons per year while smelter capacity has grown to 14.1 million tons. The 900,000-ton gap has to be filled by inventory drawdown, and it won't be. When smelters collectively cut 300,000-500,000 tons of output — which current TCs make economically rational — the refined market will swing to deficit quickly.
Zinc smelters cutting output is the next domino. You can see it coming: TCs at $40-55/dmt are unsustainable, European smelters are already running below capacity, and Chinese concentrate inventories are thinning. When smelter cuts are announced — probably in July for Q3 — SHG zinc premiums will jump. If you have Q3 or Q4 zinc requirements, lock in volumes at current premiums ($140-170/t in Europe, $120-140/t in Asia). Once smelter cuts are public, premiums will move $30-50/t higher within weeks.