Russian coal and steel group OAO Mechel (MTL) said Friday it has completed the acquisition of U.S.-privately owned Bluestone Coal Co. for $436 million and 83.3 million of its preferred shares.

Mechel assumed $132 million in debt in the process.

The West Virginia-based coking coal producer has four mining complexes comprising eight active open pit and five underground mines. Its coking coal holdings include up to an estimated 725 million metric tons of reserves and resources.

-By Alexander Kolyandr, Dow Jones Newswires; +44 20 7842 9410; alexander.kolyandr@dowjones.com