The drop in futures mirrored weakness that has prevailed in the physical market since last week, as steel mills reduced output to comply with anti-smog measures.
Physical gold demand picked up pace in major Asian hubs this week, with bullion being sold at a premium for the first time in more than three months in India.
The miner, which has pledged substantial decarbonization by 2050, is reshaping its aluminium division longer term to focus on supply chain transparency and lowering emissions.