An ongoing strike at a major copper mine is threatening to cause a major loss in an already short supply of the metal.

According to reports, a work stoppage at Chuquicamata Mine in Chile could cause a loss of 10,000 metric tons of copper from an already tight market. The strike has reached 12 days and there is little sign of agreement between the parties involved. The mine produced 321,000 tons of copper in 2018. It is operated by state run Codelco and is the company’s third largest mine.

No talks are currently scheduled between Codelco and the unions representing Chuquicamata’s striking miners. Miners have said that retirement plans and equal working conditions are the reason for the stoppage.