Chile produced 452,035 mt of copper in January, down 2.6% from the same month of last year, government figures showed Tuesday.
The monthly figure also marked a fall of 12.6% from December last year.
Chile is the world's largest producer of copper, although mine output was impaired last year by a series of accidents, strikes and stoppages. Production fell 3.5% year on year in 2016 to 5.642 million mt.
The recent figure does not reflect the impact of a strike which has halted production at the BHP Billiton-controlled Escondida mine, the world's largest copper operation.
Around 2,500 unionized workers began the indefinite strike on February 9. Despite government efforts, the two sides have yet to begin talks to diffuse the conflict.
