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Analysis of official figures by the National University of Salta suggests that the informal sector employs nearly half the workforce in Argentina .

"We came to celebrate this historic triumph," said Efrain Viveros, a 21-year-old student from the province of Salta.

In the poor, northwestern province of Salta last week, his caravan was welcomed by a group of workers waving their own buzzing chainsaws in the air.

Diaz will exhibit the piece in which Washington is shown with the jaguar, along with others from the series, “The Art of Devaluation,” in November in Salta, his hometown in northern Argentina.

Ms Lucesoli is the manager of the chamber of mining in neighbouring Salta, a province which is also rich in lithium, and she is adamant that the processes for obtaining lithium are "evolving on a daily basis with the aim of becoming more sustainable".