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Workers have previously downed tools at three mines and one processing plant operated by the Mexican steelmaker in a dispute over profit-sharing payments, the company told BNamericas.
Still in Mexico, silver exports from the world's top miner of the metal rose sharply in Q1, with gold edging lower, official data showed.
Heading south, Brazilian steelmaker Usiminas announced its decision to resume the blast furnace No.1 in its Ipatinga mill. BNamericas was told by founder and chief analyst at research firm Upside Investor, Pedro Galdi, that the move is directly related to expectations of a pick-up in economic growth.
Another Brazilian steelmaker, Gerdau, saw a 'positive surprise' coming from the US; Credit Suisse affirmed that higher rates imposed by the US department of commerce on steel imports to the country could lead to a recovery in margins in Gerdau's North America division.
Brazil also reported growing crude steel output in the first four months.
Argentina also reported increased steel production figures, year-on-year, for the period, even though numbers were slightly lower than in March.
And in Peru, metals exports gained in Q1 on prices and shipments, with copper, gold, zinc, tin, iron ore and molybdenum all rising in the first quarter as miners tapped surging metals prices.