(CNN) Five miners died in a South African copper mine Sunday after a fire trapped the workers underground, the country's Association of Mineworkers and Construction Union said.

One miner was still trapped in the Phalaborwa Mining Company in Limpopo, north of Johannesburg, the union said.

The fire began on Sunday around 1:25 a.m., according to the union. The workers were ordered to evacuate to the nearest refugee chamber, a protective chamber, the union said.

MEDIA RELEASE: AMCU MOURNS DEATH OF FIVE TRAPPED WORKERS IN BURNING COPPER MINE. AMCU has learnt with sadness of the death of five workers at Phalaborwa Mining Company. pic.twitter.com/w5lYIv3wv7 — Amcu (@_AMCU) July 15, 2018

A team later found the bodies of two miners, and a survivor, but high temperatures, which reached 67 degrees Celsius (roughly 152 degrees Fahrenheit), made rescue efforts difficult, the union said. The bodies of three mine workers were later recovered from the chamber, the union said.

The injured worker was taken to a hospital, according to the union.

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