Some border cities in China's Inner Mongolia region and Heilongjiang province have halted non-container imports by rail for commodities including iron ore.
The miners halted work last week in support of colleagues who were protesting in the capital Sarajevo against what they said were violations of work and pay regulations.
BloombergNEF data show that lithium-ion battery pack prices fell 6% from 2020 to 2021 but rising commodity prices are putting pressure on the industry.