Ключевые слова: black, coal, coal extraction, coal mine, deep, digging, energy, energy source, equipment, excavation, extraction, factory, factory work, geological, industrial, infrastructure, labor, laborers, machine, machinery, materials, mining, mining equipment, mining industry, mining site, mining tools, mining workers, operation, operation site, power, process, production, raw, raw materials, resources, site, technology, tools, work site, workers, workforce,