US Mine Safety and Health Administration spokesperson Amy Louviere told ILN that a scraper and fuel service truck were involved in a head-on collision at Peabody Western Coal’s Kayenta operation in Navajo County at about 2pm local time Friday. A fire erupted following the collision.

The name of the killed worker has not been released.

The mine was idled Friday for federal investigators to begin evaluations. Officials did not confirm Monday if the mine was still closed.

Peabody confirmed the event and said an internal investigation had also commenced, and that it had been in contact with federal, state and tribal authorities.

“We mourn the loss of a fellow employee, and we express our deepest sympathies to family members and friends,” the company said.

Peabody owns four mines in southwest US, two in Arizona and two in New Mexico.

The Kayenta mine in northeast Arizona is located on reservation lands on a highland plateau, Black Mesa. Through lease agreements with the Navajo Nation and Hopi Tribe, the mine supplies about 8 million tons of low-sulfur thermal coal per year to Navajo Generating Station under a long-term contract.

Kayenta, with more than 400 workers, extracts from multiple seams and splits of seams ranging in thickness from 3 to 15 feet.