The IMF says high export prices for oil, metals and agricultural products since 2002 had led to a terms of trade windfall close to 15% on average for the region.
President Mugabe's ZANU-PF wants to change laws compelling foreign companies, to turn over majority stakes to local blacks.
A year ago President Fernández de Kirchner announced the expropriation of 51% of Argentine oil company YPF from Spain's Repsol.
The plan aims to boost revenues from an industry where companies enjoy a more generous tax regime than in other Latin American countries.
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Canadian miner's troubles reflect authorities taking a closer look at how mining is regulated and taxed.
The stoppage is estimated to have cost Codelco more than $35 million.
Canadian gold-mining company will develop its Fruta del Norte project.
Unions representing some 25,000 workers at Codelco, the world No. 1 copper producer, and private-sector mining companies confirmed the strike.
