A strike at Doe Run Peru's Cobriza copper mine is now in its fourth day, a union official said Friday. The Cobriza mine was Peru's sixth largest last year, when it produced 18,519 metric tons of copper.

Other strikes are expected at precious metals mine operator Compania de Minas Buenaventura (BVN, BUENAVC1.VL) on Saturday, while workers at Peru's only iron mining company, Shougang Hierro Peru SAA (SHPC1.VL), are to strike Monday, said Luis Castillo, general secretary of Peru's National Federation of Mining.

On Wednesday, a strike is expected at copper producer Sociedad Minera Cerro Verde (CVERDEC1.VL), majority controlled by Freeport McMoRan Copper and Gold (FCX).

Peru is the world's No. 1 silver producer, is second in copper and sixth in gold.

-By Sophie Kevany, Dow Jones Newswires; 51-198-903-8043; sophie.kevany@dowjones.com
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