Unionized workers at copper miner Sociedad Minera Cerro Verde SAA, (CVERDEC1.VL) controlled by U.S.-based Freeport-McMoRan Copper & Gold Inc. (FCX), on Sunday published a statement saying they plan to start an indefinite strike from January 14.

The statement said that the workers belonging to the Sindicato Unico de Trabajadores de Cerro Verde will strike "due to the negative behavior of the company in solving labor problems that have been generated."

Late Friday, Cerro Verde told Peru's securities regulatory agency Conasev that it had been officially notified by the union of its plan to strike.

The company said that it will "work jointly with the union to deal with concerns and to reach mutually agreeable solutions."

Union officials said last week that there were at least six outstanding points in the collective agreement that the union says weren't being complied with. Those include transportation of workers and having the company comply with overtime payments.

In the third quarter, Cerro Verde produced 164.8 million pounds of copper, compared with 160.9 million pounds in the same quarter of the previous year.

Compania de Minas Buenaventura SAA (BVN) and a subsidiary of Sumitomo Corp. (SSUMY) also have equity stakes in the company.

The mine is in southern Peru.

-By Robert Kozak, Dow Jones Newswires; 51-99927 7269; peru@dowjones.com
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