Ключевые слова: bucket, cavern, coal, copper, deep, dig, digger, drilling, engineering, entrance, equipment, excavation, gallery, gold, history, hole, industry, inside, iron, loader, machine, machinery, mine, miner, mineral, mini, miniature, model, museum, pit, quarry, railroad, railway, retro, rock, scenery, site, small, stone, technology, tool, train, transport, truck, tunnel, tunneling, underground, underpass, vintage, wagon,