The copper market is one of the key barometers of economic growth as it is used widely in sectors as diverse as construction, electronics and automotive.
Antofagasta's profits also fell because revenues from by-products of its copper output - namely gold and molybdenum, fell 25%, albeit the impact was slightly offset by the higher gold price.
The company said covid took copper prices down to below $2.20 a pound at one stage but said it had since recovered to over $2.90/lb.
"The outlook for the remainder of the year depends largely on the impact of Covid-19 on global consumption.
"The company will continue to seek to achieve its production targets and to control its expenditure."
Antofagasta stuck with its previous guidance that its copper production this year would be at the lower end of the 725,000-755,000 tonnes range that it originally guided the market towards.
