Seaborne 37% and 44% manganese ore prices rose after some suppliers offered only limited volumes of material for January delivery.
Many Chinese alloy smelters sought to build positions in seaborne cargoes out of fear of missing out on ore prices at their comparatively low levels currently.
Concern that some miners will cut production in 2020 encouraged traders and alloy plants to accept higher-than-expected ore prices for semi-carbonate material.
Inventories rose for the eighth consecutive week to a new high indicating ample material remains available.
Chinese domestic port-side manganese...