Now, some warehouse firms are pushing the idea of replacing all rules with one that obliges warehouses to load out 1.5 percent of total stocks per day.
The move threatens to jolt China's exports of aluminium, which have been booming in recent months. Mexico "is a big market" for Chinese aluminium foil.
Australia's South32 Ltd posted a 16 percent rise in its annual underlying earnings, as healthy demand for manganese and alumina helped offset tepid output at its Illawarra coal project.
