London copper price held at $12,996 per metric ton, unchanged by 0731 GMT after hitting three‑week low since April 13.
The price dip was attributed to a stronger US dollar and worries over a global economic slowdown.
Shanghai Futures Exchange remained closed for Labour Day, with trading set to resume on Wednesday.
Meanwhile, the US and Iran launched new Gulf attacks, competing for Strait of Hormuz control via opposing blockades.