Metals Processing
The industry that smelts and refines mined ore and concentrate into usable metal; Chinese copper smelters currently operate on record-low, often negative, processing margins.
Covered in 1 MetalsCost.com News Intelligence article, most recently on August 26, 2026.
Overview
Metals processing sits between mining and finished-metal markets: it smelts concentrate into blister or matte metal, then refines it (often electrolytically) into the pure cathode, ingot or bar manufacturers buy. Smelters earn their margin mainly from the treatment and refining charge (TC/RC) miners pay them to process concentrate — a fee that collapses when too much smelting capacity chases too little available concentrate.
A Margin Squeeze in Copper
That's exactly what happened in China's copper sector through 2025: years of new smelter capacity ran ahead of mine-supply growth, pushing the benchmark treatment charge for 2026 down to $0 per tonne — a record low — after spot charges had already gone negative, to around -$60 per tonne, meaning smelters were effectively paying miners for the right to process their ore. With margins wiped out, many smelters have leaned on byproduct revenue to stay profitable, and the industry's own purchasing group agreed to cut 2026 output by roughly 10%.
Sources
- China's 2026 benchmark copper treatment charge fell to $0/tonne — China 'Firmly Opposes' Negative Copper Treatment Charges (2025)
