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Cochilco said world top copper miner Codelco saw output drop 17 percent from the same period in 2018 to 371,000 tonnes.
BHP's Escondida copper mine - the world's largest - also saw production fall 14.8 percent to 274,800 tonnes in the first quarter.
And the Collahuasi copper mine in northern Chile, a joint-venture between Anglo American and Glencore , produced 130,200 tonnes in first quarter, down 5.4 percent from the previous year.
State miner Codelco and other top producers were forced to suspend operations in January as unusually heavy rain and electric storms struck much of Chile's northern mining country, cutting off roads and collapsing bridges.