Iron roof supports in underground black coal mine

---

Size: 4500px × 3003px
Photo credit: © Daniel Jędzura / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: cave, coal, construction, copper, dark, dungeon, engineering, excavator, exploitation, extraction, factory, geology, hydraulic, industry, iron, longwall, machine, mineral, mining, movable, roof, roofing, shield, steel, support, supports, tunnel, underground, working, workings