Copper jumped back above $9,000/t on the London Metal Exchange yesterday, rising 2% to $9,080.50/t.
It was a bumper day for copper producers, with Freeport-McMoRan rising more than 7% in New York.
In London, Glencore gained 5.44%, Antofagasta rose 4.46% and Anglo American was up 3%.
In Toronto, copper hopeful THEMAC Resources Group (TSXV: MAC) rose 57% to a one-year high of C11c on no news.
The junior is advancing the previously mined Copper Flat project in New Mexico, US.
Gold was about $10 an ounce lower than this point yesterday, around $1,736/oz on the spot market.
The S&P 500 softened from its record high reached the previous day.
Market futures were pointing to a positive day in the US and UK but lower in Toronto and Australasia.