About 3,200 unionized workers at Codelco’s Chuquicamata copper mine in Chile returned to the operation on Friday, ending a two-week strike that lifted the metal’s price and triggered fresh supply fears.

The mine, Codelco’s second largest by size, had been operating at over 60% capacity during the 14-day strike, according to the state-owned company.

BMO Capital Markets analyst Colin Hamilton estimates lost production at 7,000 tonnes, which applying a separate evaluation by Chilean mining consultant PLUSmining, adds up to $35 million.

Tanner Investments’ Felipe Valenzuela forecast a 2.8% decline in Chile’s copper output for June as a consequence of the labour action.

Mining, he says, makes up 11% of Chile’s Gross Domestic Product (GDP), while Chuquicamata’s production — 321,000 tonnes of copper last year — represents only 5.5% of the country’s total output.

Codelco, which last month reported an 18% year-on-year drop in its first-quarter copper output, is in the midst of a $5.6 billion project to turn century-old Chuquicamata into an underground mine.

The last blast at the bottom of the open pit was carried out in November, though copper extraction goes on. The company has said it plans to gradually decrease activities

Chuquicamata’s switch is part of Codelco’s 10-year, $39 billion-overhaul of its core assets, and is expected to extend the iconic mine’s life by at least 40 years. It will also allow the copper giant to keep up production rates, despite falling ore grades and increasing costs at its operations.

Annual production from “Chuqui” — as locals call it — once it has fully transitioned to underground extraction is projected to be 320,000 tonnes of fine copper and 15,000 tonnes of molybdenum.

Codelco, which hands over all of its profits to the state, holds vast copper deposits, accounting for 10% of the world’s known proven and probable reserves and about 11% of the global annual copper output with 1.8 million metric tonnes of production.

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