The April-June premiums are the highest since the same quarter in 2015. In January to March, the premium was $130 per tonne. This is a third consecutive quarterly rise in premiums.
Benchmark copper on the London Metal Exchange was down 0.9% to $8,883 a tonne.
"Copper prices lurched lower after we saw the news about the ship in the Suez Canal," a copper trader said. "There may still be a knock-on effect on costs and there is still a queue, but at least the canal isn't blocked any more."
The metals sector has struggled with adopting common standards for low-carbon aluminium as rival producers fight for market share among consumers who are under pressure to cut their own emissions footprints.
S&P Global Platts said it would start issuing daily prices for both low-carbon and zero-carbon aluminium on April 6.
Shandong-based Hongqiao posted annual net income of 10.5 billion yuan ($1.62 billion) last year, according to a filing to the Hong Kong stock exchange on Friday.
Revenues were up only 2.3% year-on-year to 86.14 billion yuan, however, with Hongqiao also attributing its bumper earnings to lower production costs and lower impairment losses compared with a year earlier.