The deal follows successful test shipments of about 40,000 tons.

While officials did not release financial details of the transaction or when it will expire, Hyundai Steel will be taking low-vol coal from Corsa’s Wilson Creek complex.

“Once again, this demonstrates the quality of the Wilson Creek low-vol coal we produce and the importance of this coal in the domestic and international market,” Corsa president and chief executive officer Don Charter said.

A Hyundai spokesman said: “[W]e are delighted with the quality of the Wilson Creek low-vol coal, and see this contract as a first step in establishing a long-term relationship with Corsa.”

In addition to Wilson Creek, Corsa also controls Pennsylvania-based Maryland Energy Resources.

Corsa owns three surface mines and an underground operation.