JOHANNESBURG--Congo's government Wednesday said it will ban exports of copper and cobalt concentrate to spur more local processing of the minerals.

A government order from the ministry of mines said mining companies in the country have 90 days to export the material before the ban kicks in. The purpose of the ban is to encourage mining companies to produce "value-added products" like finished copper in the country before exporting.

This isn't the first time the government has imposed a ban on exports. It has done so previously for mineral exports from the Kivu region where tin is produced and in 2008 it said it would stop copper concentrate exports so companies would have to process the material in the country. It since reversed those bans.

Glencore International PLC (0805.HK, GLEN.LN, GLNCY), U.S. miner Freeport-McMoRan Copper & Gold Inc. (FCX) and Lundin Mining Corp. (LUNMF, LUN.T) mine for copper in the Congo. Congo is Africa's second-largest copper producer, after Zambia. Glencore declined to comment and Freeport and Lundin didn't respond to requests. Shares of all three companies traded lower Wednesday.

Congo isn't the only country pushing changes to spur more local processing, in the hopes it creates jobs and other industries. South Africa is trying to find a way to get more companies to process the gold and platinum they mine at home and is discussing imposing export limits for some minerals. Botswana successfully convinced diamond producer De Beers last year to move its diamond-sorting business to the country's capital of Gaborone.

The news of Congo's impending export ban comes as the country is reviewing its mining code. The state could decide to increase its stake in mining projects. Congo's state-owned copper company said in February it expects the country's copper industry as a whole to produce 1.5 million tons of copper in 2015, up from about 600,000 tons at the moment.

--Alex MacDonald in London contributed to this article.

Write to Devon Maylie at devon.maylie@dowjones.com

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