The price of copper is declining Tuesday morning, while preparing to end the month with a significant gain, trading data show.

March copper futures on the Comex exchange are down 0.57% to $4.161 a pound (about 0.45 kilograms).

At Monday's close of trading on the London Metal Exchange (LME), a ton of copper with delivery in three months fell by 0.58% to $9,210, aluminum - by 1.43% to $2,589.5 and zinc rose by 0.95% to $3,446.