By Robert Kozak 

Chile's government has declared a state of emergency in the northern regions of Atacama and Antofagasta, due to torrential rains that have temporarily closed various copper-mining operations.

Deputy Interior Minister Mahmud Aleuy said Thursday that the flooding has left seven dead and 19 missing.

Chile's air force was bringing aid such as drinking water and blankets to areas hit by the flooding, while other branches of the military have started to provide security, government officials said.

The heavy rains caused various mines to close and helped push the price of copper higher, mining sector analysts said.

On Thursday, May delivery copper closed up 1.90 cents, or 0.7% at $2.811 a pound on the Comex division of the New York Mercantile Exchange.

Chile is the world's biggest producer of copper.

State-owned copper company CorporaciĆ³n Nacional del Cobre de Chile, or Codelco, said Thursday it had restarted operations at its Distrito Norte mines that had been closed due to flooding Wednesday. The slowdown affected its Chuquicamata, Ministro Hales, Radomiro Tomic and Gabriela Mistral divisions.

Chile's Antofagasta PLC also shut some mines as a precautionary measure on Wednesday.

"We suspended operations at our Michilla and Centinela copper mines and at the Antucoya project (to be inaugurated later this year). All of these operations are in northern Chile, with the closest cities being Antofagasta and Calama," a company spokeswoman said in an email.

"At our Pelambres mine, which is further south, closer to La Serena, our operations are normal," she added.

Canada's Lundin Mining Corp. said its mining and milling operations at its Candelaria mine had restarted. It closed that mine and the Ojos del Salado mine due to the heavy rains and flooding that affected power and access.

Mining company Anglo American said Thursday that its Mantoverde open- pit copper-mine remained closed due to problems with electricity supplies.

Chilean airline LAN said it had canceled some flights to the northern regions. The airport in Antofagasta has been closed temporarily.

Newspaper Diaro Financiero reported that Chile's National Chamber of Commerce, Services and Tourism found that 85% of businesses in Antofogasta and Copiapo had suffered flood damage.

Write to Robert Kozak at robert.kozak@wsj.com

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