Foreign ministers from the Rio Group countries most of Latin America met those of the European Union in Panama city.
Within Latin America, Cuba is also cementing friendships, particularly after having been admitted in November to the Rio Group of nations.
It competes with other international mining and natural resources companies like Vale, BHP Billiton and the Rio Tinto group.
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Rio Tinto hired Macquarie Group to find a buyer for its majority stake in the Northparkes copper-and-gold mine in Australia, adding to a list of assets for sale.
Tuesday's move by Alcoa follows Monday's decision by Australian iron ore miners Rio Tinto and Fortescue Metals Group to cut their annual production by 10.0% due to weakening demand from China.
"Don't let the football spoil the day, " said Tom Tyler, a 32-year-old train guard from East London who traveled to Rio de Janeiro with a group of friends for a few days.
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As the delegation touched down, a group of demonstrators was gathered outside the airport in Rio to protest against planned evictions connected to the Olympics planning, according to the Associated Press.
Italian MEP Vittorio Prodi, from the Social Democrats group, said the summit should have been called "Rio-20, because we went back 20 years".
Mrs Maggie of Rio's Federal University counters with snapshots: she shows visitors group photographs of aspiring university students, all poor enough to have their vestibular fees waived, and asks them to pick out the blacks.
Separately, Riversdale , an Australian mining group with assets in Mozambique, confirmed it had been approached by Rio about a takeover.
Jess' group choose to investigate Madonna's ultimate fan, a man from Rio De Janerio who went to great lengths to meet his idol.
Since Rio, governments have been hampered by a decision there to divide the world into one group of mostly rich countries that were supposed to cut emissions and another of mostly poor ones that did not have to.
China bought a 14.99% shareholding in Rio's London-listed company, which equates to an interest of around 11% in the whole group which includes the Australian listed firm.
This is because it is difficult to create a consensus among such a large group on the technical and political issues involved, said Mike Reed, vice president of marketing for the Rio division of Santa Clara, Calif.
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