Base metals close mixed in night session; zinc falls 1.31%, tin gains 1.02%

The split between Shanghai zinc's 1.31% drop and tin's 1.02% gain points to idiosyncratic, metal-specific positioning rather than a single macro driver moving the complex. Copper's fractional moves on both international and Shanghai venues suggest the market is in a holding pattern, while the firmer aluminum and alumina prints hint at some resilience in the light-metals chain. The divergence between zinc and tin is the notable signal here. Whether that gap reflects supply-side stories or simply uneven liquidity is the open question worth watching in the sessions ahead.