TOPSHOT - Escondida copper mine miners on strike block a road in Antofagasta, Chile, on February 15, 2017. Workers at the world's largest copper mine, BHP Billiton's Escondida in Chile, began an indefinite strike on February 9 to demand pay increases, prompting concerns on world commodity markets. / AFP / Martin BERNETTI (Photo credit should read MARTIN BERNETTI/AFP/Getty Images)
Escondida copper mine miners on strike block a road in Antofagasta, Chile, on March 1, 2017. Workers at the world's largest copper mine, BHP Billiton's Escondida in Chile, began an indefinite strike on February 9 to demand pay increases, prompting concerns on world commodity markets. / AFP PHOTO / FRANCESCO DEGASPERI (Photo credit should read FRANCESCO DEGASPERI/AFP/Getty Images)
Escondida copper mine miners on strike block a road in Antofagasta, Chile, on February 16, 2017. Workers at the world's largest copper mine, BHP Billiton's Escondida in Chile, began an indefinite strike on February 9 to demand pay increases, prompting concerns on world commodity markets. / AFP / MARTIN BERNETTI (Photo credit should read MARTIN BERNETTI/AFP/Getty Images)
Escondida copper mine miners on strike block a road in Antofagasta, Chile, on March 1, 2017. Workers at the world's largest copper mine, BHP Billiton's Escondida in Chile, began an indefinite strike on February 9 to demand pay increases, prompting concerns on world commodity markets. / AFP PHOTO / FRANCESCO DEGASPERI (Photo credit should read FRANCESCO DEGASPERI/AFP/Getty Images)
Striking employees of the My Ferry Link company block the access to the harbour after setting tyres on fire on July 31, 2015 in Calais, northern France, following the failure of negotiations with French government concerning job cuts. AFP PHOTO PHILIPPE HUGUEN (Photo credit should read PHILIPPE HUGUEN/AFP/Getty Images)
