Patriot Coal is relocating its West Virginia office in Charleston to Scott Depot in Putnam County.
Patriot spokeswoman Janine Orf says the St. Louis-based coal company plans to make the switch in late summer or early fall.
The Charleston office has about 100 employees.
The company has 10 active mining complexes, with eight in West Virginia and two in western Kentucky. Patriot employs about 4,000 people across the whole company.