Ключевые слова: blue sky, business, clouds, commodities, construction, conveyor belt, deposit, development, economy, engineering, environment, equipment, extraction, geology, gravel, industrial, industry, infrastructure, landscape, machinery, material, metal, mine, mineral, mining, mountain, nature, open pit, outdoors, perspective, process, production, quarry, raw material, resource, rock, steel, stone, summer, sunny, technology, transport, transportation,