Grupo Mexico SAB, the world's seventh-largest copper producer, said 30% of employees at the San Martin copper and gold mine (Zacatecas state) didn't report to work July 5 because of a national one-day protest. The strike also halted work at Grupo Mexico's Taxco zinc and silver mine. The National Mining and Metal Workers Union said about 80% of workers at mining and steel companies across Mexico joined the strike to support Grupo Mexico workers. Miners want the company to improve safety conditions. (Bloomberg, July 5)

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